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DR. MARK CARL WILLIAMS M.D.
NPI 1932183951
Obstetrics & Gynecology - Maternal & Fetal Medicine in Fort Myers, FL

Active since December 02, 2005PECOS EnrolledAccepts Medicare Assignment
9981 HEALTHPARK CIRCLE, SUITE 159, FORT MYERS, FL 33908(239) 481-5477(239) 481-5892 Get Directions Write a Review

NPPES record last updated: September 8, 2010. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Mark Carl Williams M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK CARL WILLIAMS M.D. (NPI 1932183951) is an individual maternal & fetal medicine provider in Fort Myers, Florida, licensed in Florida (ME50517) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS and is a graduate of University Of Minnesota Medical School (1981).

NPPES Registry Identity

NPI1932183951
Entity TypeIndividualMale
Primary Taxonomy207VM0101X
Provider Legal NameDR. MARK CARL WILLIAMSCredential: M.D.
Location Address9981 HEALTHPARK CIRCLE, SUITE 159Fort Myers, FL 33908
Mailing Address9981 Health Park Circle, Suite 159Fort Myers, FL 33908 · (239) 481-5477 · Fax (239) 481-5892
Phone(239) 481-5477
Fax(239) 481-5892
Sole ProprietorNo
Medical School CMSUniversity Of Minnesota Medical SchoolGraduated 1981
Enumeration DateDecember 2, 2005
Last NPPES UpdateSeptember 8, 2010
✔ NPI 1932183951 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207VM0101X
License✔ Licensed in FL · ME50517
Definition
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.
9981 HEALTHPARK CIRCLE, Fort Myers, FL 33908
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Other Identifiers 3

Medicare ID-Type Unspecified04585XFL
Medicaid046651400FL
Medicare UPINA50881FL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Superior HealthPlan, Ambetter Health, Ambetter of Alabama and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mark Carl Williams M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3678460078
PECOS Enrollment IDI20040301001115
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Pediatrix Medical Group Of Florida Inc
101 mi
Pediatric Cardiology
1301 CONCORD TER
Sunrise, FL 33323
  • Reassigned Medicare billing, Florida enrollment
  • 236 clinicians in this Medicare group
NPI 1083711790 (954) 384-0175

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 33908 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$135.56 typical visit price
range $58.56 – $179.05
Typical copayment $33.89 (range $14.64 – $44.76)
Most-billed visit code 99204
Established Patient
$73.00 typical visit price
range $18.44 – $144.68
Typical copayment $18.25 (range $4.61 – $36.17)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MATERNAL FETAL MEDICINE OF SOUTHWEST FLORIDA PA
Obstetrics & Gynecology (Maternal & Fetal Medicine)
9981 HEALTHPARK CIRCLE, SUITE 159
FT MYERS, FL 33908
Lee County (239) 481-5477

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Williams's NPI number?

The NPI number for Mark Williams is 1932183951. It was assigned to this individual provider in the NPPES registry on December 2, 2005.

Where is Mark Williams located?

Mark Williams practices at 9981 Healthpark Circle Suite 159, Fort Myers, FL 33908. The listed phone number is (239) 481-5477.

What is Mark Williams's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Is Mark Williams enrolled in Medicare?

Yes. Mark Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Mark Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Williams reassigns Medicare benefits to Pediatrix Medical Group Of Florida Inc (Sunrise, FL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Williams accept?

Health plans from Ambetter Health, Ambetter from Superior HealthPlan, Ambetter of Alabama, AvMed and Cigna HealthCare of Florida, Inc. and 3 other insurers list Mark Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on September 8, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.