Mark Calderwood, MD
NPI 1447353024 · Ophthalmology Physician · Hamilton, MT
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Calderwood, MD is a Ophthalmology Physician provider in Hamilton, MT (NPI 1447353024).
Provider details
- NPI number
- 1447353024
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MED-PHYS-LIC-7129 (MT)
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
19 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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 221 | 53 |
| Timolol Maleate | 60 | 13 |
| Cyclosporinebrand: Restasis | 48 | 18 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 45 | 23 |
| Brimonidine Tartrate | 18 | — |
| Erythromycin Basebrand: Erythromycin | 16 | — |
| Lifitegrastbrand: Xiidra | 16 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-07
- Last updated
- 2024-11-12
- Certified
- 2024-11-12
Frequently asked questions
- What is Mark Calderwood's NPI number?
- Mark Calderwood's National Provider Identifier (NPI) is 1447353024, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Calderwood's specialty?
- Mark Calderwood is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Calderwood located?
- Mark Calderwood's practice location on file with NPPES is 300 N 10th St Ste a, Hamilton, MT 59840-5322.
- What is Mark Calderwood's phone number?
- The practice phone number listed in the NPPES registry for Mark Calderwood is (406) 363-5434.
- Does Mark Calderwood accept Medicare?
- Mark Calderwood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Calderwood's NPI active?
- Yes — Mark Calderwood's NPI (1447353024) is active in the NPPES registry as of the last update on 2024-11-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.