Warren Allen Katz, M.D.
Rheumatology Physician · Upper Gwynedd, PA
Warren Allen Katz, M.D. is a rheumatology physician with a practice address in Upper Gwynedd, Pennsylvania, and NPI 1912933805, issued on Jun 23, 2006. Check the license (Pennsylvania MD-028324-L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Warren Allen Katz
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- MD-028324-L PA
Self-reported in NPPES; status is on the state search - Practice location
- 132 Mahogany Way, Upper Gwynedd, PA 19446
- Phone
- (215) 300-1337
- Enumerated
- Jun 23, 2006
- Record last updated
- Mar 2, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (215) 699-3535
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 413 in Pennsylvania → Look up another NPI →
Verify Warren Allen Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD-028324-LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average rheumatology physician in 2024
25 Medicare Part D claims, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
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.
Warren Allen Katz among 413 rheumatology physician records in Pennsylvania
Warren Allen Katz, M.D. is one of 413 rheumatology physician records with a practice address in Pennsylvania. 80% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 53% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2017 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Pennsylvania
There are 413 rheumatology physician records in Pennsylvania.
All 413 in Pennsylvania → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Christiane Arsever, MDNorth Wales, PA 194541174454219
- Sucharitha Shanmugam, M.D.Phoenixville, PA 194601295941425
- Ammarah Hussain, M.D.Plymouth Meeting, PA 194621912355728
- Shady Abdelbaki, M.D.Pottstown, PA 194641003270414
- Stacey Fitch, DOPottstown, PA 194641760462063
- Sabahath Jaleel, MDPottstown, PA 194641144674847
- Michael Perilstein, MDPottstown, PA 194641790800092
- Joseph Scarola, M.D.Collegeville, PA 194261386996338
Common questions
What is Warren Allen Katz, M.D.'s NPI number?
Warren Allen Katz, M.D.'s National Provider Identifier (NPI) is 1912933805, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Warren Allen Katz, M.D. located?
The NPPES record lists a practice address at 132 Mahogany Way, Upper Gwynedd, PA, 19446. Phone: (215) 300-1337. Providers update this record themselves, so call before visiting.
How can I verify Warren Allen Katz, M.D.'s license?
NPPES lists Pennsylvania license number MD-028324-L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Warren Allen Katz, M.D. prescribe under Medicare Part D?
In 2024, Warren Allen Katz, M.D. had 25 Medicare Part D claims; the average among rheumatology physician prescribers was 1,978. 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.