Mary Westerholm, M.D.
NPI 1790951093 · Internal Medicine Physician · Winfield, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Westerholm, M.D. is a Internal Medicine Physician provider in Winfield, IL (NPI 1790951093).
Provider details
- NPI number
- 1790951093
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 036116854 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 28 | 11 |
| Gabapentin | 20 | — |
| Semaglutidebrand: Ozempic | 20 | — |
| Amlodipine Besylate | 18 | — |
| Metformin Hcl | 15 | — |
| Levothyroxine Sodium | 12 | — |
| Pantoprazole Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-05-06
- Last updated
- 2013-04-15
Frequently asked questions
- What is Mary Westerholm's NPI number?
- Mary Westerholm's National Provider Identifier (NPI) is 1790951093, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Westerholm's specialty?
- Mary Westerholm is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Westerholm located?
- Mary Westerholm's practice location on file with NPPES is 25 N Winfield Rd, Winfield, IL 60190-1222.
- What is Mary Westerholm's phone number?
- The practice phone number listed in the NPPES registry for Mary Westerholm is (630) 653-0848.
- Does Mary Westerholm accept Medicare?
- Mary Westerholm is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Westerholm's NPI active?
- Yes — Mary Westerholm's NPI (1790951093) is active in the NPPES registry as of the last update on 2013-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.