Mark Alexander Calderwood, MD
Ophthalmology Physician · Hamilton, MT
Mark Alexander Calderwood, MD is an ophthalmology physician with a practice address in Hamilton, Montana, and NPI 1447353024, issued on Sep 7, 2006. Check the license (Montana MED-PHYS-LIC-7129, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Alexander Calderwood
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- MED-PHYS-LIC-7129 MT
Self-reported in NPPES; status is on the state search - Practice location
- 300 N 10TH St Ste A, Hamilton, MT 59840
- Phone
- (406) 363-5434
- Enumerated
- Sep 7, 2006
- Record last updated
- Nov 12, 2024
- Fax
- (406) 363-5210
- Medicaid IDs
- 100029272 MT
1447353024 ID - Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 65 in Montana → Look up another NPI →
Also registered at 300 N 10TH St Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brock Alonzo, M.D.Glaucoma Specialist (Ophthalmology) Physician1144649138
Verify Mark Alexander Calderwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license MED-PHYS-LIC-7129Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average ophthalmology physician in 2024
524 Medicare Part D claims for 125 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 45% of claims.
Most prescribed
- Latanoprost221 claims
- Timolol Maleate60 claims
- Restasis48 claims
- Neomycin-Polymyxin-Dexameth45 claims
- Brimonidine Tartrate18 claims
- Erythromycin16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mark Alexander Calderwood among 65 ophthalmology physician records in Montana
Mark Alexander Calderwood, MD is one of 65 ophthalmology physician records with a practice address in Montana. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 22% of them.
- NPI issued2006 · 22% of these records are older, 35% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Montana
There are 65 ophthalmology physician records in Montana.
All 65 in Montana → Every provider in Hamilton → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Rick Neumeister, MDMissoula, MT 598081003984303
- Richelle Stillwagon, MDMissoula, MT 598081164783544
- John Salisbury, MDMissoula, MT 598061528052305
- Jefferson BerrymanMissoula, MT 598011275995714
- Roger Furlong, MDMissoula, MT 598011164416038
- Scott Guess, M.D.Missoula, MT 598011861543712
- Jacek Kotowski, M.D.Missoula, MT 598011134451487
- David McCann, MDMissoula, MT 598011669573713
Common questions
What is Mark Alexander Calderwood, MD's NPI number?
Mark Alexander Calderwood, MD's National Provider Identifier (NPI) is 1447353024, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Alexander Calderwood, MD located?
The NPPES record lists a practice address at 300 N 10TH St Ste A, Hamilton, MT, 59840. Phone: (406) 363-5434. Providers update this record themselves, so call before visiting.
How can I verify Mark Alexander Calderwood, MD's license?
NPPES lists Montana license number MED-PHYS-LIC-7129, as entered by the provider. Search the Montana Board of Medical Examiners at https://ebiz.mt.gov/POL/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Alexander Calderwood, MD prescribe under Medicare Part D?
In 2024, Mark Alexander Calderwood, MD had 524 Medicare Part D claims for 125 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.