Mark Hryniewich, MD
NPI 1255307781 · Internal Medicine Physician · Leominster, MA
Enrolled with Medicare as Practitioner - General Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hryniewich, MD is a Internal Medicine Physician provider in Leominster, MA (NPI 1255307781).
Provider details
- NPI number
- 1255307781
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 49755 (MA)
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 · 85 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 441 | 237 |
| Lisinopril | 168 | 88 |
| Amlodipine Besylate | 157 | 73 |
| Omeprazole | 146 | 69 |
| Losartan Potassium | 141 | 79 |
| Levothyroxine Sodium | 113 | 63 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-24
- Last updated
- 2018-12-11
Frequently asked questions
- What is Mark Hryniewich's NPI number?
- Mark Hryniewich's National Provider Identifier (NPI) is 1255307781, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hryniewich's specialty?
- Mark Hryniewich is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Hryniewich located?
- Mark Hryniewich's practice location on file with NPPES is 225 New Lancaster Rd, Leominster, MA 01453-4958.
- What is Mark Hryniewich's phone number?
- The practice phone number listed in the NPPES registry for Mark Hryniewich is (978) 466-3212.
- Does Mark Hryniewich accept Medicare?
- Mark Hryniewich is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hryniewich's NPI active?
- Yes — Mark Hryniewich's NPI (1255307781) is active in the NPPES registry as of the last update on 2018-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.