Monica M. O'Sullivan, MD
Internal Medicine Physician · West Allis, WI
Monica M. O'Sullivan, MD is an internal medicine physician with a practice address in West Allis, Wisconsin, and NPI 1043262546, issued on May 16, 2006. Check the license (Wisconsin 44298, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Monica M. O'Sullivan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 44298 WI
Self-reported in NPPES; status is on the state search - Practice location
- 11211 W Lincoln Ave, West Allis, WI 53227
- Phone
- (414) 454-8300
- Enumerated
- May 16, 2006
- Record last updated
- Sep 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (414) 327-1450
- Medicaid IDs
- 1043262546 WI
34193700 WI - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 11211 W Lincoln Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathryn Aispuro, RN, CNMAdvanced Practice Midwife1407046196
- Jessica Altis, PA-CMedical Physician Assistant1841587029
- Erin ClawsonFamily Nurse Practitioner1508494279
- Jaymie Gehring, DNP-FNPFamily Nurse Practitioner1356820476
- Megan Hintz, FNP-CFamily Nurse Practitioner1740940097
- Katrina Joski, PA-CMedical Physician Assistant1336452440
Verify Monica M. O'Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 44298Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,373 Medicare Part D claims for 425 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 19 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium180 claims
- Atorvastatin Calcium167 claims
- Amlodipine Besylate136 claims
- Hydrochlorothiazide120 claims
- Levothyroxine Sodium103 claims
- Lisinopril102 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.
Monica M. O'Sullivan among 2,078 internal medicine physician records in Wisconsin
Monica M. O'Sullivan, MD 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2021 · 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).
32 internal medicine physician records list a practice address in West Allis
They are 32 of the 1,362 NPPES records with a practice address in West Allis, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in West Allis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Dawson, MDWest Allis, WI 532271992810139
- Kathryn Havens, MDWest Allis, WI 532271164440921
- Harvey Hewes, M.D.West Allis, WI 532271255357554
- Douglas Lillie, MDWest Allis, WI 532271811004369
- Eric Luy, MDWest Allis, WI 532271538110382
- Andrew McDonagh, M.D.West Allis, WI 532271639157449
- Joan Milott, MDWest Allis, WI 532271528010238
- John Obudzinski, D.O.West Allis, WI 532271942388434
Common questions
What is Monica M. O'Sullivan, MD's NPI number?
Monica M. O'Sullivan, MD's National Provider Identifier (NPI) is 1043262546, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Monica M. O'Sullivan, MD located?
The NPPES record lists a practice address at 11211 W Lincoln Ave, West Allis, WI, 53227. Phone: (414) 454-8300. Providers update this record themselves, so call before visiting.
How can I verify Monica M. O'Sullivan, MD's license?
NPPES lists Wisconsin license number 44298, 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 Monica M. O'Sullivan, MD prescribe under Medicare Part D?
In 2024, Monica M. O'Sullivan, MD had 2,373 Medicare Part D claims for 425 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.