Brock Alonzo, M.D.
NPI 1144649138 · Glaucoma Specialist (Ophthalmology) Physician · Hamilton, MT
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brock Alonzo, M.D. is a Glaucoma Specialist (Ophthalmology) Physician provider in Hamilton, MT (NPI 1144649138).
Provider details
- NPI number
- 1144649138
- Entity type
- Individual
- Primary specialty
- Glaucoma Specialist (Ophthalmology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 77900 (MT)
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
12 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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 313 | 71 |
| Prednisolone Acetate | 162 | 86 |
| Moxifloxacin Hclbrand: Moxifloxacin | 130 | 73 |
| Timolol Maleate | 102 | 24 |
| Brimonidine Tartrate | 74 | 18 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 57 | 15 |
| Ketorolac Tromethamine | 40 | 26 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$41 across 2 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
- 2014-04-07
- Last updated
- 2025-09-11
- Certified
- 2022-02-22
Frequently asked questions
- What is Brock Alonzo's NPI number?
- Brock Alonzo's National Provider Identifier (NPI) is 1144649138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brock Alonzo's specialty?
- Brock Alonzo is listed in the NPPES registry with a primary specialty of Glaucoma Specialist (Ophthalmology) Physician (Allopathic & Osteopathic Physicians).
- Where is Brock Alonzo located?
- Brock Alonzo's practice location on file with NPPES is 300 N 10th St Ste a, Hamilton, MT 59840-5322.
- What is Brock Alonzo's phone number?
- The practice phone number listed in the NPPES registry for Brock Alonzo is (406) 363-5434.
- Does Brock Alonzo accept Medicare?
- Brock Alonzo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brock Alonzo's NPI active?
- Yes — Brock Alonzo's NPI (1144649138) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.