EXHIBIT 4.5


               HCIA Inc. 1995 Non-Employee Directors Stock Option
                                Plan, as amended






                                    HCIA INC.

                  1995 NON-EMPLOYEE DIRECTORS STOCK OPTION PLAN

                        As Amended Through August 7, 1996


1.   Definitions

     For purposes of the Plan:

          (a) "Annual Award" means an award of Options  pursuant to Section 5(b)
     of the Plan.

          (b)  "Annual  Meeting"  means  an  annual  meeting  of  the  Company's
     stockholders.

          (c) "Board" means the Board of Directors of the Company.

          (d) "Change in Control" means

               (i) the acquisition by an individual, entity or group (within the
          meaning of Section  13(d)(3) of the Exchange  Act),  other than (A) an
          employee  benefit plan (or related  trust)  sponsored or maintained by
          the Company or any of its  affiliates  or (B) AMBAC  Inc.,  a Delaware
          corporation ("AMBAC"),  AMBAC Indemnity Corporation, a Wisconsin stock
          insurance  corporation ("AIC") or any of their respective  affiliates,
          of beneficial  ownership (within the meaning of Rule 13d-3 promulgated
          under the Exchange Act) of 30% or more of the then outstanding  voting
          securities of the Company  entitled to vote  generally in the election
          of  directors or of equity  securities  having a value equal to 30% or
          more of the  total  value of all  equity  securities  of the  Company,
          provided,  however, that any securities of the Company acquired by any
          individual,  entity or group directly from AMBAC,  AIC or any of their
          respective  affiliates,  or from an underwriter or placement agent (or
          other person or entity performing  similar services) who acquired such
          securities  directly  from  AMBAC,  AIC  or any  of  their  respective
          affiliates,  shall not be included in the number of shares acquired by
          such individual, entity or group for purposes of determining whether a
          Change in Control has occurred; or

               (ii)  individuals  who as of the  Offering  Date  constitute  the
          Board, and subsequently elected members of the Board whose election is
          approved or recommended by at least a majority of such current members
          or their  successors  whose  election was so approved or  recommended,
          cease for any reason to constitute at least a majority of such Board.

     (e) "Code" means the Internal Revenue Code of 1986, as amended.





     (f)  "Committee"  means the committee  designated by the Board  pursuant to
Section 3(c) of the Plan.

     (g) "Common  Stock" means the Common  Stock of the Company,  par value $.01
per share,  or such other class or kind of shares or other  securities as may be
applicable under Section 12.

     (h) "Company" means HCIA Inc., a Maryland corporation,  or any successor to
substantially all its business.

     (i) "ERISA" means the Employee  Retirement  Income Security Act of 1974, as
amended.

     (j) "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     (k) "Fair  Market  Value"  means the  average of the highest and the lowest
quoted  selling  prices  of  the  Common  Stock  as  reported  on  the  National
Association of Securities  Dealers  Automated  Quotation  System National Market
System or such other  national  securities  exchange as may be designated by the
Committee  or, in the event that the Common Stock is not listed for trading on a
national  securities  exchange,  the average of the  highest  and lowest  quoted
selling  prices of the Common Stock as reported by the National  Association  of
Securities Dealers Automated  Quotation System ("NASDAQ"),  in any such case for
the applicable valuation date or, if there were no sales on such valuation date,
for the most recent day for which there was such a sale.

     (l) "Initial  Award" means an award of Options  pursuant to Section 5(a) of
the Plan.

     (m)  "Non-Employee  Director"  means a member  of the  Board  who is not an
employee  of the  Company or any of its  subsidiaries  and is not an employee of
AMBAC, AIC or any of their respective subsidiaries while AMBAC and AIC maintain,
in the aggregate,  an equity interest in the Company representing 25% or more of
the voting power of the Company's outstanding voting stock.

     (n) "Offering Date" means the effective date of the Company's  registration
statement no.  33-88226  relating to the initial  public  offering of the Common
Stock.

     (o) "Option" means an option to purchase  shares of Common Stock awarded to
a Non-Employee Director pursuant to the Plan.

     (p) "Option Shares" means the shares of Common stock issuable upon exercise
of an Option.

                                      -2-



     (q) "Permanent  Disability" means a physical or mental impairment rendering
a  Non-Employee  Director  substantially  unable to  function as a member of the
Board for any  period of six  consecutive  months.  Any  dispute as to whether a
Non-Employee  Director is Permanently  Disabled shall be resolved by a physician
mutually acceptable to the Non-Employee Director and the Company, whose decision
shall be final and binding upon the Non-Employee Director and the Company.

     (r) "Plan" means the HCIA Inc.  1995  Non-Employee  Directors  Stock Option
Plan as described herein.

     (s)  "Retirement"  means a Non-Employee  Director ceasing to be a member of
the  Board as a result  of  retirement  from the  Board in  accordance  with the
retirement policy then applicable to Board members.

     (t) "1933 Act" means the Securities Act of 1933, as amended.

2.   Purpose

     The purpose of the Plan is to retain the services of qualified  persons who
are not  employees of the Company to serve as members of the Board and to secure
for the Company the  benefits of the  incentives  inherent in  increased  Common
Stock ownership by Non-Employee Directors, by granting to such person options to
purchase shares of Common Stock.

3. Shares Available; Administration

     (a) Subject to the provisions of Section 12 of the Plan, the maximum number
of shares of Common  Stock  which may be issued  under the Plan shall not exceed
200,000  shares.  Either  authorized  and  unissued  shares of  Common  Stock or
treasury  shares may be delivered upon exercise of Options  awarded  pursuant to
the Plan.

     (b) If Options  have been  forfeited to the Company as described in Section
6(d),  the Options Shares  underlying  such Options shall again be available for
issuance in connection with future awards under the Plan.

     (c) The Plan will be  administered  by a committee  designated by the Board
and  composed  exclusively  of  members  of the Board  who are not  Non-Employee
Directors  (the  "Committee").  The  Committee  may adopt rules and  regulations
necessary to carry out the Plan's purposes.  The Committee's  interpretation and
construction of any Plan provision shall be final and conclusive.

4.   Eligibility

     Options awarded  pursuant to the Plan shall be granted only to Non-Employee
Directors.

                                      -3-



5.   Awards

     (a)  Initial  Award.  On the  date  of a  Non-Employee  Director's  initial
election or appointment to the Board (or in the case of a Non-Employee  Director
who is a member of the Board as of the Offering  Date,  on the  Offering  Date),
such Non-Employee  Director  (including any Non-Employee  Director  reelected or
reappointed  after a period of at least 12 calendar  months  during which he did
not serve on the  Board)  shall be granted an  Initial  Award  consisting  of an
Option to purchase  5,000 shares of Common  Stock.  Such Option shall have a per
share  exercise  price equal to the Fair Market Value of the Common Stock on the
date of award and shall be  subject  to the  vesting  schedule  provided  for in
Section 6(a) and the other terms and conditions provided for herein.

     (b) Annual  Awards.  At each  Annual  Meeting,  commencing  with the Annual
Meeting held in 1995 subsequent to the Offering Date, each person who has served
as a member  of the Board  during  the  period  elapsed  since  the  immediately
preceding  Annual  Meeting (or in the case of the Annual  Meeting  held in 1995,
each  person who has served as a member of the Board since the  Offering  Date),
and who has,  during  all or a  portion  of such  service,  been a  Non-Employee
Director for purposes of the Plan shall be granted as of the date of such Annual
Meeting an Annual  Award  consisting  of an Option to purchase  5,000  shares of
Common  Stock  (or such  lesser  number  determined  by  multiplying  5,000 by a
fraction,  the numerator of which is the number of full or partial  months since
the  immediately  preceding  Annual  Meeting (or Offering  Date, if  applicable)
during which such person  served on the Board in the capacity of a  Non-Employee
Director,  and the  denominator of which is the number of full or partial months
since  the   immediately   preceding   Annual  Meeting  (or  Offering  Date,  if
applicable)).  Such Option  shall have a per share  exercise  price equal to the
Fair Market  Value of the Common Stock on the date of award and shall be subject
to the vesting  schedule  provided  for in Section  6(b) and the other terms and
conditions provided for herein.

6.   Vesting

     (a)  Vesting  of  Initial  Awards.  Initial  Awards  shall  vest and become
exercisable as follows:

          (i) An Initial Award made other than in connection with a Non-Employee
     Director's  initial  election to the Board at an Annual  Meeting shall vest
     and become exercisable in two equal installments as of the first and second
     anniversaries of the date of grant, provided that the Non-Employee Director
     remains  in  service as a member of the Board  until the  relevant  vesting
     date.

          (ii)  An  Initial  Award  made  in  connection   with  a  Non-Employee
     Director's  initial  election to the Board at an Annual  Meeting shall vest
     and  become  exercisable  as to 50% of the  Options  Shares  subject to the
     Option  constituting  such Initial Award as of the date of the first Annual
     Meeting  following  the date of award,  and as to the  remaining 50% of the
     Option  Shares  subject to such Option as of the date of the second  Annual
     Meeting following the date of award,  provided the Non-Employee Director to
     whom such  Annual  Award was made





     continues  in service as a member of the Board until the  relevant  vesting
     date (whether or not the Non-Employee  Director is nominated for reelection
     at the Annual  Meeting held on either  vesting date, and whether or not, if
     nominated, he is reelected).

     (b)  Vesting of Annual  Awards.  Each  Annual  Award  shall vest and become
exercisable  as of the date of the first Annual  Meeting  following  the date of
award,  provided  the  Non-Employee  Director to whom such Annual Award was made
continues in service as a member of the Board until the vesting date (whether or
not the Non-Employee  Director is nominated for reelection at the Annual Meeting
held on such vesting date, and whether or not, if nominated, he is reelected).

     (c)  Accelerated  Vesting.  Notwithstanding  anything  to the  contrary  in
Sections 6(a) and 6(b), an Option shall become fully vested and exercisable upon
the first to occur of (i) a Non-Employee  ceasing to be a member of the Board as
a result of  death,  Permanent  Disability  or  Retirement,  or (ii) a Change in
Control of the Company.

     (d) Forfeiture.  In the event of a Non-Employee  Director's  termination of
service as a member of the Board for any  reason  other  than  death,  Permanent
Disability  or  Retirement  prior  to the  satisfaction  of any  vesting  period
requirement  hereof,  the  unvested  portion  of  any  Options  awarded  to  the
Non-Employee  Director  shall  be  forfeited  to the  Company  as of the date of
termination  of service,  and the  Non-Employee  Director  shall have no further
right or interest therein.

7.   Term of Options

     (a)  Ten-Year  Term.  Each Option  shall  expire ten years from its date of
award, subject to earlier termination as provided herein.

     (b) Exercise Following Certain  Terminations of Service.  If a Non-Employee
Director's service as a member of the Board terminates for any reason other than
death, Permanent Disability or Retirement,  the Non-Employee Director shall have
the right,  subject to the terms and conditions  hereof, to exercise the Option,
to the extent it has vested as of the date of such  termination  of service,  at
any time within six months  after the date of such  termination,  subject to the
earlier expiration of the Option as provided in Section 7(a). At the end of such
six-month period the Option shall expire.

     (c)  Exercise  Following  Termination  of Service  Due to Death,  Permanent
Disability or Retirement.  If a Non-Employee  Director's  service as a member of
the Board terminates by reason of death, Permanent Disability or Retirement, all
Options  awarded  to  such  Non-Employee  Director  may  be  exercised  by  such
Non-Employee  Director,  or by his or her  estate,  personal  representative  or
beneficiary,  as the case may be, at any time  within one year after the date of
termination  of  service,  subject to the  earlier  expiration  of the Option as
provided in Section 7(a).  At the end of such  one-year  period the Option shall
expire.

                                      -5-



     (d) Exercise  Following  Termination of Service Subject to Company Policies
and Procedures on Insider Trading. Any exercise of an Option pursuant to Section
7(b) or 7(c) following  termination of a  Non-Employee  Director's  service as a
member of the Board for any reason  other than  death  shall be subject  to, and
shall be permitted only to the extent such exercise  complies with, the policies
and procedures of the Company concerning insider trading that were applicable to
the  Non-Employee  Director on the date of such  termination of service (as such
policies and procedures may be amended by the Company during the period provided
in Section 7(b) or 7(c), as the case may be, for exercise of the Option).

8.   Time and Manner of Exercise

     (a) Notice of Exercise. Subject to the other terms and conditions hereof, a
Non-Employee  Director may exercise any Options (to the extent vested) by giving
written notice of exercise to the Company, provided,  however, that no less than
10 Option  Shares may be purchased  upon any  exercise of the Option  unless the
number of Option  Shares  purchased  at such time is the total  number of Option
Shares in respect of which an Option is then exercisable, and provided, further,
that in no event shall an Option be exercisable for a fractional share. The date
of exercise of an Option shall be the later of (i) the date on which the Company
receives such written notice or (ii) the date on which the  conditions  provided
in Section 8(b) are satisfied.  Notwithstanding  any other provision of the Plan
or of the notice of award  relating to an Option  provided  for in Section 9, no
Option may be exercised,  whether in whole or in part, and no Option Shares will
be issued by the Company in respect of any such attempted exercise,  at any time
when such  exercise is prohibited  by Company  policy then in effect  concerning
transactions  by a  Non-Employee  Director in the Company's  securities.  In the
event that a  Non-Employee  Director  gives  written  notice of  exercise to the
Company at a time when such exercise is  prohibited by such policy,  the Company
in its sole  discretion  may  disregard  such notice of exercise or may consider
such notice to be delivered as of the first date that the Non-Employee  Director
is permitted to exercise such option in accordance with such Company policy.

     (b)  Payment.  Prior to the issuance of a  certificate  pursuant to Section
8(e) hereof evidencing the Option Shares in respect of which all or a portion of
an Option shall have been exercised,  a Non-Employee Director shall have paid to
the Company the Option  Price for all Option  Shares  purchased  pursuant to the
exercise of such Option.  Payment may be made by personal  check,  bank draft or
postal or express money order (such modes of payment are  collectively  referred
to as "cash")  payable to the order of the Company in U.S.  dollars or in shares
of Common Stock already owned by the Non-Employee  Director valued at their Fair
Market Value as of the last business day  preceding the date of exercise,  or in
any  combination  of cash or such shares as the  compensation  committee  of the
Board in it sole discretion may approve. Payment of the exercise price in shares
of  Common  Stock  shall  be  made  by  delivering  to  the  Company  the  share
certificate(s) representing the required number of shares, with the Non-Employee
Director  signing his or her name on the back,  or by attaching  executed  stock
powers (the signature of the Non-Employee  Director must be guaranteed in either
case).

                                      -6-





     (c) Stockholder  Rights. A Non-Employee  Director shall have no rights as a
stockholder with respect to any shares of Common Stock issuable upon exercise of
an Option until a certificate  evidencing  such shares shall have been issued to
the Non-Employee  Director  pursuant to Section 8(e), and no adjustment shall be
made for dividends or  distributions or other rights in respect of any share for
which the record date is prior to the date upon which the Non-Employee  Director
shall become the holder of record thereof.

     (d)  Limitation  on  Exercise.  No Option shall be  exercisable  unless the
Common Stock subject  thereto has been  registered  under the Securities Act and
qualified  under  applicable  state "blue sky" laws in connection with the offer
and  sale  thereof,  or the  Company  has  determined  that  an  exemption  from
registration  under the Securities Act and from  qualification  under such state
"blue sky" laws is available.

     (e) Issuance of Shares. Subject to the foregoing conditions,  as soon as is
reasonably  practicable  after its receipt of a proper  notice of  exercise  and
payment of the Option  Price for the number of shares with  respect to which the
Option is exercised,  the Company shall deliver to the Non-Employee Director (or
following  the  Non-Employee  Director's  death,  such other person  entitled to
exercise the Option),  at the  principal  office of the Company or at such other
location as may be acceptable to the Company and the  Non-Employee  Director (or
such other person), one or more stock certificates for the appropriate number of
shares of Common  Stock issued in  connection  with such  exercise.  Such shares
shall be fully  paid and  nonassessable  and  shall be issued in the name of the
Non-Employee Director (or such other person).

     (f) Tax  Withholding.  The  Company  shall  have  the  right,  prior to the
delivery of any certificates evidencing shares of Common Stock to be issued upon
full or partial  exercise of an Option,  to require a  Non-Employee  Director to
remit to the Company any amount  sufficient  to satisfy  any  Federal,  state or
local tax  withholding  requirements.  The Company  may permit the  Non-Employee
Director to satisfy,  in whole or in part,  such  obligation to remit taxes,  by
directing the Company to withhold shares of Common Stock that would otherwise be
received by the Non-Employee  Director,  pursuant to such rules as the Committee
may establish from time to time. The Company shall also have the right to deduct
from all cash payments  made  pursuant to or in  connection  with the Option any
Federal,  state or local  taxes  required to be  withheld  with  respect to such
payments.

     (g)  Restrictions on Transfer.  An Option may not be transferred,  pledged,
assigned, or otherwise disposed of, except by will or by the laws of descent and
distribution or pursuant to a qualified  domestic  relations order as defined in
the Code or Title I of ERISA ("QDRO").  The Option shall be exercisable,  during
the Participant's lifetime, only by the Participant or by the person to whom the
Option has been transferred pursuant to a QDRO. No assignment or transfer of the
Option, or of the rights represented thereby,  whether voluntary or involuntary,
by  operation  of law or  otherwise,  except by will or the laws of descent  and
distribution or pursuant to a QDRO, shall vest in the assignee or transferee any
interest or right in the Option,  but immediately  upon any attempt to assign or
transfer the Option the same shall terminate and be of no force or effect.

                                      -7-



     (h) Non-qualified Status of Options. Options awarded under the Plan are not
intended to qualify,  and shall not be treated,  as an "incentive stock options"
within the  meaning of Section  422 of the  Internal  Revenue  Code of 1986,  as
amended.

9.   Notice of Award

     The terms and  conditions  of each award of Options  shall be embodied in a
notice of award which shall contain terms and conditions not  inconsistent  with
the Plan and which shall incorporate the Plan by reference. Each notice of award
shall state the date on which the  Options  were  granted,  the number of shares
subject to such Option and the per share exercise price therefor.

10.  Effective Date; Term of the Plan

     The effective date of the Plan shall be the Offering  Date.  Unless earlier
terminated  in  accordance  with  Section  11 below,  the term of the Plan shall
expire on the tenth  anniversary  of the  Offering  Date.  After such  date,  no
further awards of Options may be made hereunder,  but previously  granted awards
shall remain outstanding subject to the terms hereof.

11.  Amendments

     The Board may at any time and from time to time  alter,  amend,  suspend or
terminate the Plan in whole or in part, provided,  however, that in no event may
the provisions of the Plan  respecting  eligibility to participate or the timing
or amount of awards be amended more frequently than once every six months, other
than to  comport  with  changes in the Code,  ERISA or any rules or  regulations
thereunder,  provided,  further, that any amendment which under the requirements
of applicable law must be approved by the  stockholders of the Company shall not
be effective  unless and until such  stockholder  approval has been  obtained in
compliance with such law, and provided, further, that any amendment that must be
approved by the  stockholders  of the Company in order to maintain the continued
qualification  of the Plan under  Rule  16b-3  under the  Exchange  Act,  or any
successor  provision,  shall not be effective  unless and until such stockholder
approval has been  obtained in  compliance  with such rule.  No  termination  or
amendment  of the Plan may,  without the consent of the  Non-Employee  Director,
affect any such person's rights under the provisions of the Plan with respect to
awards of Options which were made prior to such action.

12.  Adjustment of and Changes in Common Stock

     In   the   event   of   any   merger,   consolidation,    recapitalization,
reclassification,   stock  dividend,  distribution  of  property,  special  cash
dividend, or other change in corporate structure affecting the Common Stock, the
Committee  shall make such  adjustments,  if any, as it  considers  necessary or
appropriate  in the number and class of shares  subject to Options or authorized
to be awarded hereunder,  in order to prevent dilution or enlargement of rights.
Any new or additional

                                      -8-



Options  awarded  pursuant  to such  adjustments  shall be subject to all of the
terms and conditions of the Plan.

13.  No Right to Reelection

     Nothing in the Plan shall be deemed to create any obligation on the part of
the  Board to  nominate  any of its  members  for  reelection  by the  Company's
stockholders,  nor confer upon any  Non-Employee  Director the right to remain a
member  of the  Board  for any  period  of time,  or at any  particular  rate of
compensation.

14.  Governing Law

     The Plan and all notices  issued or agreements  entered into under the Plan
shall be construed in  accordance  with and governed by the laws of the State of
Maryland.

15.  No Restriction on Right of Company to Effect Corporate Changes

     The Plan shall not  affect in any way the right or power of the  Company or
its stockholders to make or authorize any or all adjustments, recapitalizations,
reorganizations  or other  changes in the  Company's  capital  structure  or its
business,  or any merger or consolidation of the Company,  or any issue of stock
or of options,  warrants or rights to  purchase  stock or of bonds,  debentures,
preferred or prior preference  stocks whose rights are superior to or affect the
Common Stock or the rights thereof or which are convertible into or exchangeable
for Common Stock, or the dissolution or liquidation of the Company,  or any sale
or transfer of all or any part of its assets or business, or any other corporate
act or proceeding, whether of a similar character or otherwise.