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BROCK ALONZO M.D.
NPI 1144649138
Ophthalmology - Glaucoma Specialist in Hamilton, MT

Active since April 07, 2014PECOS EnrolledAccepts Medicare Assignment
300 N 10TH ST STE A, HAMILTON, MT 59840(406) 363-5434(406) 363-5210 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 11, 2025, Feb 22, 2022, Sep 24, 2020 and 2 more (5 updates tracked since 2018).

About Brock Alonzo M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

BROCK ALONZO M.D. (NPI 1144649138) is an individual glaucoma specialist in Hamilton, Montana, licensed in Montana (77900) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS, is affiliated with Bitterroot Health - Daly Hospital, and is a graduate of Oregon Health Sciences University School Of Medicine (2014).

NPPES Registry Identity

NPI1144649138
Entity TypeIndividualMale
Primary Taxonomy207WX0009X
Provider Legal NameBROCK ALONZOCredential: M.D.
Location Address300 N 10TH ST STE AHamilton, MT 59840-5322
Mailing Address300 N 10th St Ste AHamilton, MT 59840-5322 · (406) 363-5434 · Fax (406) 363-5210
Phone(406) 363-5434
Fax(406) 363-5210
Sole ProprietorNo
Medical School CMSOregon Health Sciences University School Of MedicineGraduated 2014
Enumeration DateApril 7, 2014
Last NPPES UpdateSeptember 11, 20255 updates tracked since enumeration
NPPES CertifiedFebruary 22, 2022
✔ NPI 1144649138 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmology · Glaucoma SpecialistAllopathic & Osteopathic Physicians
Taxonomy Code207WX0009X
License✔ Licensed in MT · 77900
Definition
An ophthalmologist who specializes in the treatment of glaucoma and other disorders related to increased intraocular pressure and optic nerve damage. This specialty involves the medical and surgical treatment of these conditions.
300 N 10TH ST STE A, Hamilton, MT 59840
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Brock Alonzo M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2567770415
PECOS Enrollment IDI20190828002677
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Brock Alonzo reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Marcus Daly Memorial Hospital Corporation
Same address
Ophthalmology
300 N 10TH ST, SUITE A
Hamilton, MT 59840
  • Reassigned Medicare billing, Montana enrollment
  • Also billed through NPI 1659475846 (Montana)
  • 154 clinicians in this Medicare group
NPI 1285676445 (406) 363-5434
University Of Utah Adult Services
381 mi
Dermatology
165 N. UNIVERSITY AVE. FARMINGTON
Farmington, UT 84025
  • Reassigned Medicare billing, Utah enrollment
  • 2,620 clinicians in this Medicare group
NPI 1649724139 (801) 213-3200
University Of Utah
396 mi
General Acute Care Hospital
50 N MEDICAL DR
Salt Lake City, UT 84132
  • Reassigned Medicare billing, Utah enrollment
  • 144 clinicians in this Medicare group
NPI 1588656870 (801) 581-2121

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Bitterroot Health - Daly Hospital

Critical Access Hospitals · Hamilton, MT
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number271340
Location1200 Westwood DrHamilton, MT 59840 · Ravalli County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 59840 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$130.52 typical visit price
range $56.81 – $172.26
Typical copayment $32.63 (range $14.20 – $43.06)
Most-billed visit code 99204
Established Patient
$70.82 typical visit price
range $18.24 – $140.32
Typical copayment $17.70 (range $4.56 – $35.08)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MARK ALEXANDER CALDERWOOD MD
Ophthalmology
300 N 10TH ST STE A
HAMILTON, MT 59840
Ravalli County (406) 363-5434

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Brock Alonzo's NPI number?

The NPI number for Brock Alonzo is 1144649138. It was assigned to this individual provider in the NPPES registry on April 7, 2014.

Where is Brock Alonzo located?

Brock Alonzo practices at 300 N 10th St Ste A, Hamilton, MT 59840. The listed phone number is (406) 363-5434.

What is Brock Alonzo's specialty?

The primary specialty registered for this NPI is Ophthalmology, specializing in Glaucoma Specialist, with taxonomy code 207WX0009X.

Is Brock Alonzo enrolled in Medicare?

Yes. Brock Alonzo is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Brock Alonzo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Brock Alonzo reassigns Medicare benefits to 3 organizations: Marcus Daly Memorial Hospital Corporation (Hamilton, MT), University Of Utah Adult Services (Farmington, UT) and University Of Utah (Salt Lake City, UT). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Brock Alonzo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Brock Alonzo accept?

Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and Providence Health Plan list Brock Alonzo as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Brock Alonzo affiliated with any hospitals?

According to CMS data, Brock Alonzo is affiliated with Bitterroot Health - Daly Hospital.

When was this NPI record last updated?

The NPPES record for Brock Alonzo was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.