DR. CARL M WILLIAMS M.D.
NPI 1003971490
Internal Medicine - Critical Care Medicine in Fort Wayne, IN
About Dr. Carl M Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CARL M WILLIAMS M.D. (NPI 1003971490) is an individual critical care medicine provider in Fort Wayne, Indiana, licensed in Wisconsin (60181-20) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS, is affiliated with Parkview Regional Medical Center, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Secondary Practice Locations 3
Other Identifiers 7
Accepted 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. Carl M 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.
Medicare Billing Reassignments
8Medicare enrollment records show Carl Williams reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fort Wayne, IN 46845
- Reassigned Medicare billing, Indiana enrollment
- 1,752 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Wisconsin enrollment
- 1,155 clinicians in this Medicare group
Evansville, IN 47714
- Reassigned Medicare billing, Indiana enrollment
- 34 clinicians in this Medicare group
West Newton, PA 15089
- Reassigned Medicare billing, Pennsylvania enrollment
- 669 clinicians in this Medicare group
Plover, WI 54467
- Reassigned Medicare billing, Wisconsin enrollment
- 2,476 clinicians in this Medicare group
Stevens Point, WI 54482
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Aspirus Medical Group, Inc.
- 415 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Richmond, VA 23226
- Reassigned Medicare billing, Virginia enrollment
- 134 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Parkview Regional Medical Center
Acute Care Hospitals · Fort Wayne, INAscension St Vincent Evansville
Acute Care Hospitals · Evansville, INMarshfield Medical Center - Weston
Acute Care Hospitals · Weston, WIMarshfield Medical Center - Minocqua
Acute Care Hospitals · Minocqua, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 46845 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
FORT WAYNE, IN 46845
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 Carl Williams's NPI number?
The NPI number for Carl Williams is 1003971490. It was assigned to this individual provider in the NPPES registry on December 26, 2006. The provider is also known as Carl Marc Williams MD.
Where is Carl Williams located?
Carl Williams practices at 11104 Parkview Circle Dr, Fort Wayne, IN 46845. The listed phone number is (260) 373-9700.
What is Carl Williams's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Carl Williams enrolled in Medicare?
Yes. Carl 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 organizations bill Medicare for Carl Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Carl Williams reassigns Medicare benefits to 8 organizations: Parkview Health System,inc. (Fort Wayne, IN), Mercy Health System Corporation (Janesville, WI), Cep America - Intensivists PC (Evansville, IN), Excela Health Physician Practices, Inc. (West Newton, PA), Mchs Hospitals, Inc. (Plover, WI) and 3 more organizations, listed in the Medicare section above. Each 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 Carl Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Carl Williams accept?
Health plans from Anthem Blue Cross and Blue Shield, CareSource, HealthPartners and Sanford Health Plan list Carl 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.
Is Carl Williams affiliated with any hospitals?
According to CMS data, Carl Williams is affiliated with Parkview Regional Medical Center, Ascension St Vincent Evansville, Marshfield Medical Center - Weston and Marshfield Medical Center - Minocqua.
When was this NPI record last updated?
The NPPES record for Carl Williams was last updated on May 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.
# Dr. Carl M Williams, M.D. · NPI 1003971490
Critical Care Medicine physician in Fort Wayne, Indiana. Individual provider, active in the CMS NPPES registry since December 26, 2006.
## Identity
- **NPI:** 1003971490 (Entity type: Individual)
- **Enumerated:** December 26, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 60181-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 11104 PARKVIEW CIRCLE DR, Fort Wayne, IN 46845-1672
- **Phone:** (260) 373-9700 · **Fax:** (260) 373-9740
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Parkview Health System,inc. (NPI 1437461449, Fort Wayne, IN); Mercy Health System Corporation (NPI 1598718603, Janesville, WI); Cep America - Intensivists PC (NPI 1851228431, Evansville, IN); Excela Health Physician Practices, Inc. (NPI 1073609236, West Newton, PA); Mchs Hospitals, Inc. (NPI 1386249894, Plover, WI); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Maryland School Of Medicine, class of 1995
## Record status
- **NPPES last updated:** May 14, 2026
- **Other identifiers:** Other 2051760 (PA); Medicaid 200869120 (IN); Medicaid 1003971490 (WI); and 4 more
---
Source: [NPI Profile](https://npiprofile.com/npi/1003971490) · Data from the CMS NPPES public registry.