James P. Mazzulla, M.D.
Internal Medicine Physician · Milwaukee, WI
James P. Mazzulla, M.D. is an internal medicine physician with a practice address in Milwaukee, Wisconsin, and NPI 1437144946, issued on Sep 12, 2005. Check the license (Wisconsin 20804, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- James P. Mazzulla
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20804 WI
Self-reported in NPPES; status is on the state search - Practice location
- 2500 W Layton Ave, Milwaukee, WI 53221
- Phone
- (414) 282-2006
- Enumerated
- Sep 12, 2005
- Record last updated
- Nov 20, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (414) 281-8704
- Medicaid ID
- 30321000 WI
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 2500 W Layton Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Andy Feld, P.T.Physical Therapist1184668626
- Michelle Ferguson, P.T.Physical Therapist1073534509
- Constance Ganapes, M.D.Internal Medicine Physician1063405751
- Kurt HackbarthPhysical Therapist1528412798
- Barbara Haines, OTOccupational Therapist1801225966
Verify James P. Mazzulla in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 20804Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
109 Medicare Part D claims for 19 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Montelukast Sodium17 claims
- Losartan Potassium15 claims
- Donepezil Hcl14 claims
- Pravastatin Sodium14 claims
- Metoprolol Tartrate13 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.
James P. Mazzulla among 2,078 internal medicine physician records in Wisconsin
James P. Mazzulla, M.D. is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2008 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
382 internal medicine physician records list a practice address in Milwaukee
They are 382 of the 18,389 NPPES records with a practice address in Milwaukee, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Milwaukee → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Constance Ganapes, M.D.Milwaukee, WI 532211063405751
- Fernando Itable, M.D.Milwaukee, WI 532211871586560
- Goran Rudic, M.D.Milwaukee, WI 532211164491940
- Joseph Trojan, M.D.Milwaukee, WI 532211225022700
- Turgut Zia, MDMilwaukee, WI 532211699783894
- Mesfin Abdissa, MDMilwaukee, WI 532201376579417
- Ismael Abu Limon, MDGreenfield, WI 532201467945543
- Stephen Baker, M.D.Wauwatosa, WI 532221518931013
Common questions
What is James P. Mazzulla, M.D.'s NPI number?
James P. Mazzulla, M.D.'s National Provider Identifier (NPI) is 1437144946, issued on Sep 12, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James P. Mazzulla, M.D. located?
The NPPES record lists a practice address at 2500 W Layton Ave, Milwaukee, WI, 53221. Phone: (414) 282-2006. Providers update this record themselves, so call before visiting.
How can I verify James P. Mazzulla, M.D.'s license?
NPPES lists Wisconsin license number 20804, 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 James P. Mazzulla, M.D. prescribe under Medicare Part D?
In 2024, James P. Mazzulla, M.D. had 109 Medicare Part D claims for 19 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.