DR. JOHN P WILLIAMS DO
NPI 1598744393
Pathology - Cytopathology in Gulfport, FL
About Dr. John P Williams Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN P WILLIAMS DO (NPI 1598744393) is an individual cytopathology provider in Gulfport, Florida, licensed in Florida (OS4755) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Sun City Center, and is a graduate of At Still University Of Health Sciences, College Of Osteo Med, Kirksville (1983).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
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. John P Williams Do 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
4Medicare enrollment records show John Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pinellas Park, FL 33781
- Reassigned Medicare billing, Florida enrollment
- 10 clinicians in this Medicare group
Clearwater, FL 33762
- Reassigned Medicare billing, Florida enrollment
- 108 clinicians in this Medicare group
Dunedin, FL 34698
- Reassigned Medicare billing, Florida enrollment
- Medicare enrollment name: Advanced Gastroenterology Associates LLC
- 10 clinicians in this Medicare group
New Smyrna Beach, FL 32168
- Reassigned Medicare billing, Florida enrollment
- 13 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 7
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 33707 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 John Williams's NPI number?
The NPI number for John Williams is 1598744393. It was assigned to this individual provider in the NPPES registry on January 11, 2006.
Where is John Williams located?
John Williams practices at 2821 Seabreeze Dr S, Gulfport, FL 33707. The listed phone number is (727) 667-2074.
What is John Williams's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Cytopathology, with taxonomy code 207ZC0500X.
Is John Williams enrolled in Medicare?
Yes. John 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 John Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Williams reassigns Medicare benefits to 4 organizations: Surgical Pathology Laboratories PA (Pinellas Park, FL), West Central Gastroenterology LLP (Clearwater, FL), Trustees Of Mease Hospital Inc (Dunedin, FL) and Mark A Nagrani MD PA (New Smyrna Beach, FL). 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 John Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Williams was last updated on February 20, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Dr. John P Williams, DO · NPI 1598744393
Cytopathology physician in Gulfport, Florida. Individual provider, active in the CMS NPPES registry since January 11, 2006.
## Identity
- **NPI:** 1598744393 (Entity type: Individual)
- **Enumerated:** January 11, 2006
- **Primary specialty:** Pathology - Cytopathology · taxonomy 207ZC0500X
- **State license:** OS4755 (Florida)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2821 SEABREEZE DR S, Gulfport, FL 33707-3931
- **Phone:** (727) 667-2074 · **Fax:** (727) 343-4716
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Surgical Pathology Laboratories PA (NPI 1184698086, Pinellas Park, FL); West Central Gastroenterology LLP (NPI 1144454703, Clearwater, FL); Trustees Of Mease Hospital Inc (NPI 1336125640, Dunedin, FL); Mark A Nagrani MD PA (NPI 1326194713, New Smyrna Beach, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** At Still University Of Health Sciences, College Of Osteo Med, Kirksville, class of 1983
## Record status
- **NPPES last updated:** February 20, 2020
- **Other identifiers:** Medicaid 274114800 (FL)
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Source: [NPI Profile](https://npiprofile.com/npi/1598744393) · Data from the CMS NPPES public registry.