Mark Zemanek, DO
NPI 1154065886 · Physician Nutrition Specialist (Internal Medicine) · Cleveland, OH
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Zemanek, DO is a Physician Nutrition Specialist (Internal Medicine) provider in Cleveland, OH (NPI 1154065886).
Provider details
- NPI number
- 1154065886
- Entity type
- Individual
- Primary specialty
- Physician Nutrition Specialist (Internal Medicine)Allopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
83% 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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 23 | 13 |
| Amlodipine Besylate | 18 | 11 |
| Losartan Potassium | 16 | — |
| Metformin Hcl | 16 | — |
| Prednisone | 13 | — |
| Gabapentin | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2022-04-27
- Last updated
- 2026-01-08
- Certified
- 2026-01-08
Frequently asked questions
- What is Mark Zemanek's NPI number?
- Mark Zemanek's National Provider Identifier (NPI) is 1154065886, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Zemanek's specialty?
- Mark Zemanek is listed in the NPPES registry with a primary specialty of Physician Nutrition Specialist (Internal Medicine) (Allopathic & Osteopathic Physicians).
- Where is Mark Zemanek located?
- Mark Zemanek's practice location on file with NPPES is 2049 E 100th St, Cleveland, OH 44106-2104.
- What is Mark Zemanek's phone number?
- The practice phone number listed in the NPPES registry for Mark Zemanek is (216) 444-2200.
- Does Mark Zemanek accept Medicare?
- Mark Zemanek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Zemanek's NPI active?
- Yes — Mark Zemanek's NPI (1154065886) is active in the NPPES registry as of the last update on 2026-01-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.