Mark Chelmowski, MD
NPI 1659306041 · Internal Medicine Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Chelmowski, MD is a Internal Medicine Physician provider in Milwaukee, WI (NPI 1659306041).
Provider details
- NPI number
- 1659306041
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 27584 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
274 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 90 | $120 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 56 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 55 | $85 |
| Administration of Influenza Virus VaccineG0008 | 36 | $30 |
| Admn Sarscov2 Vacc 1 Dose90480 | 23 | $41 |
| Hemoglobin A1c Level83036 | 14 | $10 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 184 | 60 |
| Amlodipine Besylate | 83 | 31 |
| Losartan Potassium | 76 | 27 |
| Losartan/Hydrochlorothiazidebrand: Losartan-Hydrochlorothiazide | 53 | 15 |
| Metformin Hcl | 44 | 15 |
| Simvastatin | 39 | 14 |
| Lisinopril |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-12
- Last updated
- 2021-12-16
- Certified
- 2021-12-16
Frequently asked questions
- What is Mark Chelmowski's NPI number?
- Mark Chelmowski's National Provider Identifier (NPI) is 1659306041, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Chelmowski's specialty?
- Mark Chelmowski is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Chelmowski located?
- Mark Chelmowski's practice location on file with NPPES is 3003 W Good Hope Road, Milwaukee, WI 53209.
- What is Mark Chelmowski's phone number?
- The practice phone number listed in the NPPES registry for Mark Chelmowski is (414) 352-3100.
- Does Mark Chelmowski accept Medicare?
- Mark Chelmowski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Chelmowski's NPI active?
- Yes — Mark Chelmowski's NPI (1659306041) is active in the NPPES registry as of the last update on 2021-12-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.