Brock Alonzo, M.D.
Glaucoma Specialist (Ophthalmology) Physician · Hamilton, MT
Brock Alonzo, M.D. is a glaucoma specialist (ophthalmology) physician with a practice address in Hamilton, Montana, and NPI 1144649138, issued on Apr 7, 2014. Check the license (Montana 77900, as entered in NPPES) on the Montana Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Brock Alonzo
- Credential
- M.D.
- Primary taxonomy
- Glaucoma Specialist (Ophthalmology) Physician 207WX0009X
- License number
- 77900 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
- Apr 7, 2014
- Record last updated
- Sep 11, 2025
- Fax
- (406) 363-5210
- Entity
- Type 1 · individual
1 nearest glaucoma specialist (ophthalmology) physician record → All 2 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.
- Mark Calderwood, MDOphthalmology Physician1447353024
Verify Brock Alonzo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMontana Board of Medical Examiners
Search for license 77900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average glaucoma specialist (ophthalmology) physician in 2024
1,001 Medicare Part D claims for 181 beneficiaries, against an average of 3,060 among the 430 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims.
Most prescribed
- Latanoprost313 claims
- Prednisolone Acetate162 claims
- Moxifloxacin130 claims
- Timolol Maleate102 claims
- Brimonidine Tartrate74 claims
- Dorzolamide-Timolol57 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.
Industry payments in 2024: $41.36
2 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 391 providers of this specialty with any payment received $5,284.60 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Glaucoma Specialist (Ophthalmology) Physician providers in Montana
There are 2 glaucoma specialist (ophthalmology) physician records in Montana.
All 2 in Montana → Every provider in Hamilton → Glaucoma Specialist (Ophthalmology) Physician nationwide →
The 1 glaucoma specialist (ophthalmology) physician record with the nearest ZIP codes
- Colin McInnis, M.D.Bozeman, MT 597181891173225
Common questions
What is Brock Alonzo, M.D.'s NPI number?
Brock Alonzo, M.D.'s National Provider Identifier (NPI) is 1144649138, issued on Apr 7, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Brock Alonzo, M.D. 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 Brock Alonzo, M.D.'s license?
NPPES lists Montana license number 77900, 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 Brock Alonzo, M.D. prescribe under Medicare Part D?
In 2024, Brock Alonzo, M.D. had 1,001 Medicare Part D claims for 181 beneficiaries; the average among glaucoma specialist (ophthalmology) physician prescribers was 3,060. 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.