Monica O'Sullivan, MD
NPI 1043262546 · Internal Medicine Physician · West Allis, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Monica O'Sullivan, MD is a Internal Medicine Physician provider in West Allis, WI (NPI 1043262546).
Provider details
- NPI number
- 1043262546
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 44298 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 180 | 92 |
| Atorvastatin Calcium | 167 | 79 |
| Amlodipine Besylate | 136 | 64 |
| Hydrochlorothiazide | 120 | 45 |
| Levothyroxine Sodium | 103 | 54 |
| Losartan Potassium | 102 | 44 |
| Lisinopril |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-16
- Last updated
- 2021-09-09
- Certified
- 2021-09-09
Frequently asked questions
- What is Monica O'Sullivan's NPI number?
- Monica O'Sullivan's National Provider Identifier (NPI) is 1043262546, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Monica O'Sullivan's specialty?
- Monica O'Sullivan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Monica O'Sullivan located?
- Monica O'Sullivan's practice location on file with NPPES is 11211 W Lincoln Ave, West Allis, WI 53227-1035.
- What is Monica O'Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Monica O'Sullivan is (414) 454-8300.
- Does Monica O'Sullivan accept Medicare?
- Monica O'Sullivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Monica O'Sullivan's NPI active?
- Yes — Monica O'Sullivan's NPI (1043262546) is active in the NPPES registry as of the last update on 2021-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.