Mark Antonishen, M.D.
NPI 1518971654 · Internal Medicine Physician · Boyne City, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Antonishen, M.D. is a Internal Medicine Physician provider in Boyne City, MI (NPI 1518971654).
Provider details
- NPI number
- 1518971654
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301046169 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 119 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 672 | 177 |
| Lisinopril | 455 | 117 |
| Levothyroxine Sodium | 344 | 85 |
| Omeprazole | 341 | 93 |
| Amlodipine Besylate | 329 | 86 |
| Metoprolol Succinate | 288 | 71 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$43 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-27
- Last updated
- 2024-02-02
- Certified
- 2024-02-02
Frequently asked questions
- What is Mark Antonishen's NPI number?
- Mark Antonishen's National Provider Identifier (NPI) is 1518971654, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Antonishen's specialty?
- Mark Antonishen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Antonishen located?
- Mark Antonishen's practice location on file with NPPES is 223 N Park St, Boyne City, MI 49712-1220.
- What is Mark Antonishen's phone number?
- The practice phone number listed in the NPPES registry for Mark Antonishen is (231) 582-8010.
- Does Mark Antonishen accept Medicare?
- Mark Antonishen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Antonishen's NPI active?
- Yes — Mark Antonishen's NPI (1518971654) is active in the NPPES registry as of the last update on 2024-02-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.