Mark Williams, MD
Nephrology Physician · Winter Park, FL
Mark Williams, MD is a nephrology physician with a practice address in Winter Park, Florida, and NPI 1770558702, issued on Feb 22, 2006. Check the license (Florida ME54570, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Mark Williams
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- ME54570 FL
Self-reported in NPPES; status is on the state search - Practice location
- 3727 N Goldenrod RD Ste 105, Winter Park, FL 32792
- Phone
- (407) 657-0296
- Enumerated
- Feb 22, 2006
- Record last updated
- Nov 7, 2022
- Medicaid ID
- 061510200 FL
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 840 in Florida → Look up another NPI →
Also registered at 3727 N Goldenrod RD Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Chidambaram Valliappan, M.D.Nephrology Physician1265815021
Verify Mark Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME54570Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average nephrology physician in 2024
329 Medicare Part D claims for 114 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Farxiga75 claims
- Jardiance56 claims
- Losartan Potassium19 claims
- Kerendia18 claims
- Calcitriol14 claims
- Doxazosin Mesylate14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mark Williams among 840 nephrology physician records in Florida
Mark Williams, MD is one of 840 nephrology physician records with a practice address in Florida. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 16% of them.
- NPI issued2006 · 16% of these records are older, 50% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileNo · 79% of these records are
- Record last updated2022 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Florida
There are 840 nephrology physician records in Florida.
All 840 in Florida → Every provider in Winter Park → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Alexandra Hardy, MDWinter Park, FL 327921598391401
- Mark Lagatta, M.D.Winter Park, FL 327921821081985
- Ijlal Uddin, M.D.Winter Park, FL 327921760652879
- Chidambaram Valliappan, M.D.Winter Park, FL 327921265815021
- Jafar Mahmood, M.D.Winter Park, FL 327891154387165
- Shobana Sivan, MDWinter Park, FL 327891922365485
- Manuel Dee, M.D.Titusville, FL 327961659316370
- Imran Rashid, M.D.Titusville, FL 327961912900325
Common questions
What is Mark Williams, MD's NPI number?
Mark Williams, MD's National Provider Identifier (NPI) is 1770558702, issued on Feb 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Williams, MD located?
The NPPES record lists a practice address at 3727 N Goldenrod RD Ste 105, Winter Park, FL, 32792. Phone: (407) 657-0296. Providers update this record themselves, so call before visiting.
How can I verify Mark Williams, MD's license?
NPPES lists Florida license number ME54570, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Williams, MD prescribe under Medicare Part D?
In 2024, Mark Williams, MD had 329 Medicare Part D claims for 114 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.