Dr. John P. Williams, DO
- Medicare services, 2024
- 23,454
- Medicare patients, 2024
- 5,101
- Part D claims, 2024
- 11
- Publications
- 1
- Industry payments
- $112
- Practice address
- 560 Jackson St, Ste 200, Saint Petersburg, FL 33705
- Practice phone
- Call (727) 820-7500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St. Petersburg Endoscopy Center
Surgery Center - Medicare-Certified · Saint Petersburg, Florida
Find Dr. Williams' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John P. Williams is a cytopathology physician in Saint Petersburg, Florida
Dr. Williams practices at St. Petersburg Endoscopy Center in Saint Petersburg, Florida.
Dr. Williams' NPI, 1598744393, was assigned on January 11, 2006. Dr. Williams graduated from Kirksville College of Osteopathic Medicine in 1983. Dr. Williams holds Florida license OS4755.
- NPI
- 1598744393NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8820056369
- NPI enumeration date
- January 11, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (727) 820-7500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John P. Williams practices at St. Petersburg Endoscopy Center in Saint Petersburg, Florida
Dr. Williams' primary practice is St. Petersburg Endoscopy Center, at 560 Jackson St, Ste 200, Saint Petersburg, FL 33705. The practice phone is (727) 820-7500.
- St. Petersburg Endoscopy Center560 Jackson St, Ste 200, Saint Petersburg, FL 33705Phone(727) 820-7500
Source: Dmand AI Affiliation Data
Dr. John P. Williams is affiliated with 2 sites of care and 5 medical groups
Dr. Williams' primary practice is St. Petersburg Endoscopy Center in Saint Petersburg, Florida. The medical group on file is Gastro Florida. Dmand AI also links Dr. Williams to 4 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John P. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Petersburg Endoscopy Center | Available with a free account |
| +1 more site and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John P. Williams is one of 20 cytopathology physicians in Florida
Cytopathology is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207ZC0500X. Dr. Williams is board certified in anatomic pathology & clinical pathology by the American Board of Pathology. Dr. Williams is licensed in Florida.
Specialties and state licenses
- Cytopathology, FloridaPrimary
Cytopathology physicians near Dr. Williams
Counts of cytopathology physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John P. Williams billed Medicare for 23,454 services in 2024
CMS data shows 23,454 Medicare services from Dr. Williams across 7 procedure codes in 2024, for 5,101 Medicare patients. Medicare paid $1,208,544 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 21,1012024: 23,45411%
Dr. Williams compared with the Florida median for cytopathology physicians, 2024
- Dr. Williams
- Florida median
- Medicare services
- 23,454vs 1,58614.8 times
- Medicare patients
- 5,101vs 5888.7 times
Medians across 17 cytopathology physicians in Florida with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other cytopathology physicians in Florida.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John P. Williams treated 5,101 Medicare patients in 2024, average age 73
CMS counts 5,101 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 2,878 patients. 75% of them have high cholesterol, and 73% have high blood pressure. 3% are also on Medicaid. Their average risk score is 1.10, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 67, with 54% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women2,72853%
- Men2,37347%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High cholesterol75%
- High blood pressure73%
- Arthritis48%
- Ischemic heart disease31%
- Anxiety25%
- Chronic kidney disease25%
- Diabetes25%
- Mood disorders23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John P. Williams wrote 11 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 11 Medicare Part D claims. 100% of them were for generic drugs. They cover 1 drug, with $147 in total drug cost. In 2017, CMS named 11 claims across 1 drug.
Dr. Williams' most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2019
- 2017
- 2019
- Claims for drugs CMS names
- 2017: 112019: 129%
Drugs named by CMS: 1 in 2019, 1 in 2017.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John P. Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John P. Williams has 1 publication on record
Dmand AI links 1 paper to Dr. Williams in 2023. Dr. Williams' most frequent co-author is Umesh Choudhry, MD.
Dr. Williams' most frequent co-authors
Recent publications by Dr. Williams
See who Dr. Williams researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williams works with, so you can find a warm path to the right cytopathology physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John P. Williams received $112 in industry payments from 2016 to 2021
CMS Open Payments shows 2 general payments to Dr. Williams from 2 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 100% of the total. Alexion Pharmaceuticals, Inc. paid the most, $90.
General payments to Dr. Williams by program year, 2016 to 2021
Companies that paid Dr. Williams the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John P. Williams graduated from Kirksville College of Osteopathic Medicine
Dr. Williams graduated from Kirksville College of Osteopathic Medicine in 1983.
- Medical school
- Board certified in anatomic pathology & clinical pathology
- Board certified in cytopathology
- Board certified in 1987 - 2005
- Board certified in 1984 - 2026
- Board certified in 1993 - 2007
- Board certified in 1994 - 2010
Source: Dmand AI Professional Profile Data
Dr. John P. Williams accepts plans from 5 insurance carriers
Dr. Williams is in network with 5 carriers, including Excellus BlueCross BlueShield, United Healthcare and Blue Cross and Blue Shield of Kansas City. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
- United Healthcare
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- HCSC
Plan types Dr. Williams accepts, by number of carriers
- Medicare3
- EPO2
- HMO2
- POS2
- PPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. John P. Williams's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John P. Williams
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John P. Williams' NPI number?
Dr. John P. Williams' NPI number is 1598744393. It was assigned on January 11, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John P. Williams?
Dr. John P. Williams is a cytopathology physician in Saint Petersburg, Florida. The primary specialty in the NPI Registry is Cytopathology Physician (taxonomy code 207ZC0500X).
Where does Dr. John P. Williams practice?
Dr. Williams practices at 560 Jackson St, Ste 200, Saint Petersburg, FL 33705. Dr. Williams' primary practice is St. Petersburg Endoscopy Center in Saint Petersburg, Florida. Dmand AI also links Dr. Williams to 4 medical groups and 1 group practice or clinic.
What is Dr. John P. Williams' office phone number?
The practice phone on file for Dr. Williams is (727) 820-7500.
What is Dr. John P. Williams' medical license number?
Dr. Williams holds Florida license OS4755.
What medical group is Dr. John P. Williams part of?
Dr. Williams is linked to Gastro Florida. Dmand AI links Dr. Williams to 4 more medical groups.
Does Dr. John P. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 23,454 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. John P. Williams see?
CMS counts 5,101 Medicare patients who saw Dr. Williams in 2024, with an average age of 73.
Is Dr. John P. Williams board certified?
Yes. Dr. Williams is board certified in anatomic pathology & clinical pathology by the American Board of Pathology.
What services does Dr. John P. Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were lab and pathology test (88305), lab and pathology test (88332) and lab and pathology test (88342).
Show 7 more questionsShow fewer questions
Where did Dr. John P. Williams go to medical school?
Dr. Williams graduated from Kirksville College of Osteopathic Medicine in 1983.
What drugs does Dr. John P. Williams prescribe most?
In 2019 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Fluticasone Propionate.
Has Dr. John P. Williams received payments from drug or device companies?
CMS Open Payments shows $112 in general payments to Dr. Williams from 2 companies from 2016 to 2021. The largest total came from Alexion Pharmaceuticals, Inc.
How long has Dr. John P. Williams been practicing?
Dr. Williams graduated from medical school in 1983, 43 years ago.
Does Dr. John P. Williams do research?
Dmand AI links 1 publication to Dr. Williams.
Who does Dr. John P. Williams publish with?
Dr. Williams' most frequent co-authors are Umesh Choudhry, MD (1 shared paper).
What insurance does Dr. John P. Williams accept?
Dr. Williams is in network with 5 carriers, including Excellus BlueCross BlueShield, United Healthcare and Blue Cross and Blue Shield of Kansas City. Medicare plans come from the most carriers, 3. Check the plan with the practice before a visit.
Selling to cytopathology practices?
See cytopathology physicians in Florida by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card