SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  ------------

                                  ANNUAL REPORT
                        PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                                    FORM 11-K


[X] ANNUAL REPORT  PURSUANT TO SECTION 15(d) OF THE SECURITIES  EXCHANGE ACT OF
     1934

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2000

OR

[ ] Transition Report Pursuant To Section 13 Or 15(d) Of The Securities Exchange
    Act Of 1934 For the transition period from _______________ to ______________


                         Commission File Number 1-13154


A.   Full title of the plan and the address of the plan, if different  from that
     of the issuer named below:

                            AMERICAN MEDICAL SECURITY
                             RETIREMENT SAVINGS PLAN


B.   Name of issuer of the securities  held pursuant to the plan and the address
     of its principal executive office:

                      AMERICAN MEDICAL SECURITY GROUP, INC.
                               3100 AMS Boulevard
                               Green Bay, WI 54313






                American Medical Security Retirement Savings Plan

                           Annual Report on Form 11-K
                   For the Fiscal Year Ended December 31, 2000



                                TABLE OF CONTENTS


                                                                            PAGE
Financial Statements and Supplemental Schedule
Years ended December 31, 2000 and 1999

         Report of Independent Auditors........................................3

         Financial Statements

         Statements of Net Assets Available for Benefits.......................4
         Statements of Changes in Net Assets Available for Benefits............5
         Notes to Financial Statements.........................................6


         Supplemental Schedule

         Schedule H, Line 4i--Schedule of Assets (Held at End of Year)........10

Signatures....................................................................11

Exhibit 23 - Consent of Independent Auditors..................................12



                                                                               2


ERNST & YOUNG                Ernst & Young, LLP            Phone:(414)  273-5900
                             111 East Kilbourn Avenue      Fax:  (414)  223-7200
                             Milwaukee, Wisconsin 53202    www.ey.com


                         Report of Independent Auditors

The Administrative Committee
American Medical Security
   Retirement Savings Plan

We have audited the accompanying statements of net assets available for benefits
of American Medical Security Retirement Savings Plan as of December 31, 2000 and
1999, and the related  statement of changes in net assets available for benefits
for the years then ended.  These financial  statements are the responsibility of
the  Plan's  management.  Our  responsibility  is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable  assurance about whether the financial  statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting  the amounts and  disclosures in the financial  statements.  An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all  material  respects,  the net assets  available  for benefits of the Plan at
December  31,  2000 and 1999,  and the changes in its net assets  available  for
benefits for the years then ended,  in  conformity  with  accounting  principles
generally accepted in the United States.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The  accompanying  supplemental  schedule of assets
(held at end of year) as of December  31,  2000,  is  presented  for purposes of
additional  analysis and is not a required part of the financial  statements but
is  supplementary  information  required by the  Department of Labor's Rules and
Regulations for Reporting and Disclosure  under the Employee  Retirement  Income
Security Act of 1974. This  supplemental  schedule is the  responsibility of the
Plan's management.  The supplemental schedule has been subjected to the auditing
procedures  applied  in our  audits  of the  financial  statements  and,  in our
opinion,  is fairly stated in all material respects in relation to the financial
statements taken as a whole.

                                                           /s/ ERNST & YOUNG LLP
March 2, 2001


       Ernst & Young LLP is a member of Ernst & Young International, Ltd.

                                                                               3



                American Medical Security Retirement Savings Plan

                 Statement of Net Assets Available for Benefits




                                                                                   DECEMBER 31
                                                                             2000              1999
                                                                      -------------------------------------
                                                                                        
ASSETS
Investments, at fair value (NOTE 3):
   Mutual funds                                                             $45,034,467       $45,444,071
   Common stock of American Medical Security Group, Inc.                        254,806           148,412
   Participant loans receivable                                                 984,340           694,086
                                                                      -------------------------------------
Net assets available for benefits                                           $46,273,613       $46,286,569
                                                                      =====================================



SEE ACCOMPANYING NOTES.

                                                                               4



                American Medical Security Retirement Savings Plan

            Statement of Changes in Net Assets Available for Benefits




                                                                             YEAR ENDED DECEMBER 31
                                                                            2000                1999
                                                                     --------------------------------------
                                                                                       
Investment income (loss):
   Net realized and unrealized appreciation (depreciation) in
     fair value of investments (NOTE 3)                                   $ (2,471,486)      $  2,819,876
   Interest and dividends                                                       49,824          3,359,109
                                                                     --------------------------------------
                                                                            (2,421,662)         6,178,985
   Less investment expense                                                     149,435            130,128
                                                                     --------------------------------------
                                                                            (2,571,097)         6,048,857
Contributions:
   Employers'                                                                1,934,006          2,498,761
   Employees'                                                                5,028,871          6,684,527
                                                                     --------------------------------------
                                                                             6,962,877          9,183,288
   Other                                                                         8,375                  -
                                                                     --------------------------------------
Total additions                                                              4,400,155         15,232,145

Benefits paid                                                                4,413,111          5,906,055
                                                                     --------------------------------------
Net increase (decrease)                                                        (12,956)         9,326,090

Net assets available for benefits at beginning of year                      46,286,569         36,960,479
                                                                     --------------------------------------
Net assets available for benefits at end of year                           $46,273,613        $46,286,569
                                                                     ======================================









SEE ACCOMPANYING NOTES.
                                                                               5



                American Medical Security Retirement Savings Plan

                          Notes to Financial Statements

                                December 31, 2000

1. DESCRIPTION OF THE PLAN

The following  description of the American Medical Security  Retirement  Savings
Plan (the Plan) provides only general information.  Participants should refer to
the Plan document for a complete description of the Plan's provisions.

GENERAL

The Plan is a contributory  defined contribution plan covering all full-time and
part-time  employees of American  Medical  Security  Group,  Inc. (AMSG) and its
subsidiaries,  American  Medical  Security,  Inc.  and  Nurse  Healthline,  Inc.
(collectively  AMSG,  the  Company  or  Employer).  The Plan is  subject  to the
provisions of the Employee Retirement Income Security Act of 1974 (ERISA).

PLAN CHANGES

On May 1, 1999, the Plan introduced an option to allow participants to invest in
the common stock of AMSG.

PARTICIPATION AND VESTING

Employees  are  eligible  to become  contributing  participants  in the Plan and
receive  matching  contributions  on the  first  of the  following  month  after
reaching the age of eighteen and after 30 days of eligible service. Participants
are  eligible  for  Company  profit-sharing  contributions  after six  months of
service.  Participants  must have worked 1,000 hours in a Plan year to receive a
profit-sharing  contribution.  Effective January 1, 2001, employees with 30 days
of service  that are  employed on the last day of the Plan year will be entitled
to receive profit-sharing contributions for the Plan year.

Participants are immediately vested in their  contributions plus actual earnings
thereon.  Effective  January 1, 2000,  new  participants  do not vest in Company
contributions  until  three years of  service,  at which time they become  fully
vested.  Participants  in the Plan prior to  January  1,  2000,  vest in Company
contributions  according to the following  schedule  (1,000 hours of service are
required to constitute a year of vesting service):

         Years of Vesting Service                Vesting Percentage
   -----------------------------------        -------------------------
                 1                                         0%
                 2                                        30
                 3                                       100


                                                                               6


                American Medical Security Retirement Savings Plan

                    Notes to Financial Statements (continued)


1. DESCRIPTION OF THE PLAN (CONTINUED)

The nonvested portion of the Company's profit sharing and matching contributions
are  forfeited  when  a  participant   terminates   employment.   Profit-sharing
forfeitures  are allocated to the remaining  Plan  participants,  while matching
contribution  forfeitures  are used to  reduce  future  matching  contributions.
During 2000 and 1999,  the  Company  utilized  forfeited  amounts of $75,000 and
$77,000, respectively, to offset the required matching contribution.

CONTRIBUTIONS, WITHDRAWALS AND LOANS

Plan participants are permitted to make contributions on a before-tax basis each
payroll period of 2% to 18% of base compensation and subject to a maximum amount
allowed by the  Internal  Revenue  Code  (IRC).  Participants  can change  their
before-tax contribution percentage each quarter.

Effective  January  1,  2000,  the  Company  contributes  60% of the first 6% of
compensation  that a participant  contributes  to the Plan.  Prior to January 1,
2000, the Company matched  contributions  at 50% of the first 6% of compensation
that  a  participant   contributed  to  the  Plan.  Additional  amounts  may  be
contributed at the option of the Company.

Distributions due to retirement,  death, permanent disability and termination of
employment are provided for as defined within the Plan.

Participants  may borrow  from  their fund  accounts a minimum of $1,000 up to a
maximum of the lesser of one-half of their  vested  account  balance or $50,000.
The loan is  secured  by the  balance  in the  participant's  account  and bears
interest at a rate  commensurate with prevailing rates as determined by the Plan
administrator. Principal and interest are repaid through payroll deductions.

TERMINATION OF THE PLAN

The Company has established the Plan with the intention and expectation that the
Employer  will  be able to make  contributions  indefinitely,  but the  Employer
neither is nor shall be under any obligation or liability whatsoever to maintain
the Plan for any given length of time.  The Company  retains the right to modify
or terminate the Plan at any time, but may not retroactively reduce the share of
any  participant  or cause the  Plan's  assets to revert to the  Company  unless
required by law. In the event of termination,  the balance of each participant's
account would become fully vested,  and all assets would be  distributed  to the
participants and beneficiaries

                                                                               7


                American Medical Security Retirement Savings Plan

                    Notes to Financial Statements (continued)


1. DESCRIPTION OF THE PLAN (CONTINUED)

EXPENSES

Administrative expenses of the Plan are paid from Plan assets.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

INVESTMENT VALUATION AND ACCOUNTING METHOD

The Plan's financial statements are prepared on the accrual basis of accounting.
The Plan's  investments are stated at fair value.  The fair value of mutual fund
shares and AMSG common stock are based on the quoted  market  values on the last
business  day of the Plan year.  Participant  loans are  stated at their  unpaid
principal balance, which approximates fair value.

USE OF ESTIMATES

The preparation of financial statements in conformity with accounting principles
generally  accepted in the United States  requires the Company to make estimates
that  affect  the  amounts  reported  in the  Plan's  financial  statements  and
accompanying notes. Actual results could differ from these estimates.

3. INVESTMENTS

The following  individual  investments  represent more than 5% of the Plan's net
assets available for benefits:



                                                                                       DECEMBER 31
                                                                                  2000            1999
                                                                             ---------------------------------
                                                                                           
Investments at fair value as determined by quoted market price:
   Hotchkis & Wiley International Fund                                       $           -       $  3,130,074
   MCM Stable Value Fund                                                         5,114,719          5,029,845
   Scudder Growth & Income Fund                                                  8,369,765          9,103,267
   Warburg Pincus Emerging Growth Fund                                           6,807,042          7,680,510
   Lazard Small Cap Fund                                                                 -          2,442,640
   Lexington Worldwide Emerging Markets Fund                                             -          2,534,491
   Alleghany Montag & Caldwell Growth Fund                                      11,144,704         12,582,088
   Mercury HW International Value                                                3,824,071                  -
   Neuberger Berman Genesis Trust                                                3,735,904                  -


                                                                               8


                American Medical Security Retirement Savings Plan

                    Notes to Financial Statements (continued)


3. INVESTMENTS (CONTINUED)

The Plan's  investments,  including gains and losses on investments bought, sold
and held during the year, appreciated (depreciated) in fair value as follows:



                                                                                    DECEMBER 31
                                                                             2000               1999
                                                                        ------------------------------------

                                                                                        
Mutual funds                                                              $(2,484,095)        $2,866,445
Common stock of American Medical Security Group, Inc.                          12,609            (46,569)
                                                                        ------------------------------------
                                                                          $(2,471,486)        $2,819,876
                                                                        ====================================


4. INCOME TAX STATUS

The Plan has received a determination  letter from the Internal  Revenue Service
dated May 11, 2000 stating that the Plan is qualified  under  Section  401(a) of
the IRC and,  therefore,  the related  trust is not subject to tax under present
income tax law. The Plan  administrator  is not aware of any course of action or
series of events  that have  occurred  that  might  adversely  affect the Plan's
qualified status. Subsequent amendments to the Plan have been structured to, and
are intended to maintain the Plan's qualified status.

5. TRANSACTIONS WITH PARTIES IN INTEREST

Investment fees incurred are paid by participants. In addition, certain services
are provided by the Plan sponsor at no cost to the Plan.

                                                                               9


                American Medical Security Retirement Savings Plan

                    Employer Identification Number 39-1431799
                                 Plan Number 001

         Schedule H, Line 4I - Schedule of Assets (Held at End of Year)

                                December 31, 2000




                    IDENTITY OF ISSUER, BORROWER/                           UNITS/              CURRENT
                      DESCRIPTION OF INVESTMENT                             SHARES               VALUE
- -------------------------------------------------------------------------------------------------------------

                                                                                      
American Century - International Growth Investor                              19,150        $     209,309
Dreyfus Appreciation                                                               -                    6
Dreyfus GNMA Fund                                                             56,399              809,891
Dreyfus S&P 500                                                               18,517              712,726
Gabelli Equity Income                                                          3,787               56,466
Loomis Sayles Bond Fund Institutional                                        100,979            1,116,828
Mercury HW International Value                                               155,577            3,824,071
Alleghany Montag & Caldwell Growth Fund                                      400,456           11,144,704
Montgomery Emerging Markets                                                        1                    5
MCM Stable Value Advisory                                                    439,939            5,114,719
INVESCO Small Company Growth                                                  16,810              258,033
Janus Twenty Fund                                                             10,106              553,807
Neuberger Berman Genesis Trust                                               139,660            3,735,904
Pilgrim Worldwide Emerging Markets                                           164,540            1,314,672
Scudder Growth & Income Fund                                                 346,575            8,369,765
Warburg Pincus Emerging Growth Fund                                          189,611            6,807,042
Warburg Pincus Global Fixed Income                                           103,658            1,006,518
American Medical Security Group, Inc. common stock*                           45,620              254,807
Participant loans receivable                                                 984,340              984,340
                                                                                        ---------------------
                                                                                              $46,273,613
                                                                                        =====================


*Represents a party in interest to the Plan.


                                                                              10



                                   SIGNATURES


     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Administrative  Committee of the American  Medical Security  Retirement  Savings
has duly  caused  this  annual  report to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


DATE:   June 8, 2001


                                    AMERICAN MEDICAL SECURITY
                                    RETIREMENT SAVINGS PLAN

                                    /S/ GARY D. GUENGERICH
                                    Gary D. Guengerich
                                    American Medical Security Retirement Savings
                                    Plan Administrative Committee Member






                                                                              11



                                                                      Exhibit 23


CONSENT OF INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement (Form
S-8 No.  333-75477)  pertaining  to the  American  Medical  Security  Retirement
Savings Plan of American Medical Security Group,  Inc. of our report dated March
2, 2001, with respect to the financial  statements and schedules of the American
Medical  Security  Retirement  Savings Plan  included in the Annual Report (Form
11-K) for the year ended December 31, 2000.


                                                          /s/  ERNST & YOUNG LLP

Milwaukee, WI
June 8, 2001


                                                                              12