Thomas A. Gahl, MD
Family Medicine Physician · Milwaukee, WI
Thomas A. Gahl, MD is a family medicine physician with a practice address in Milwaukee, Wisconsin, and NPI 1942535711, issued on Oct 12, 2009. Check the license (Wisconsin 55015, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Thomas A. Gahl
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 55015 WI
Self-reported in NPPES; status is on the state search - Practice location
- 633 E Mason St, Milwaukee, WI 53202
- Phone
- (414) 665-8400
- Enumerated
- Oct 12, 2009
- Record last updated
- Jun 2, 2015 (not updated in 11 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 633 E Mason St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kim Wesling, NPNurse Practitioner1508973132
- Sijia Wu, MDFamily Medicine Physician1184112799
Verify Thomas A. Gahl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 55015Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average family medicine physician in 2024
1,880 Medicare Part D claims for 175 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 32 claims were for opioids.
Most prescribed
- Atorvastatin Calcium187 claims
- Losartan Potassium137 claims
- Hydrochlorothiazide82 claims
- Rosuvastatin Calcium75 claims
- Omeprazole69 claims
- Ozempic62 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.
Thomas A. Gahl among 3,765 family medicine physician records in Wisconsin
Thomas A. Gahl, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 63% of them.
- NPI issued2009 · 63% of these records are older, 35% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2015 · 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 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
299 family medicine physician records list a practice address in Milwaukee
They are 299 of the 18,389 NPPES records with a practice address in Milwaukee, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Milwaukee → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Mario Kapetsonis, M.D.Milwaukee, WI 532021306833991
- Mary Kuder, MDMilwaukee, WI 532021962932970
- Kristin Magliocco, MDMilwaukee, WI 532021679004980
- Patrick McGrath, D.O.Milwaukee, WI 532021598761983
- William Palin, M.D.Milwaukee, WI 532021104171586
- Tatiana Petrikova, M.D.Milwaukee, WI 532021528313061
- Craig Reich, MDMilwaukee, WI 532021396857561
- Geoffrey Swain, M.D.Milwaukee, WI 532021861663007
Common questions
What is Thomas A. Gahl, MD's NPI number?
Thomas A. Gahl, MD's National Provider Identifier (NPI) is 1942535711, issued on Oct 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Thomas A. Gahl, MD located?
The NPPES record lists a practice address at 633 E Mason St, Milwaukee, WI, 53202. Phone: (414) 665-8400. Providers update this record themselves, so call before visiting.
How can I verify Thomas A. Gahl, MD's license?
NPPES lists Wisconsin license number 55015, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas A. Gahl, MD prescribe under Medicare Part D?
In 2024, Thomas A. Gahl, MD had 1,880 Medicare Part D claims for 175 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.