What is Errol Grannum's specialty?

Errol Grannum (NPI 1508897935) is a Medicare-billing provider whose primary specialty is Ophthalmology in Mcallen, TX.

Where does Errol Grannum practice?

Errol Grannum practices in Mcallen, TX, based on the location reported in the CMS Medicare provider datasets for NPI 1508897935.

How much does Medicare pay Errol Grannum?

Errol Grannum (NPI 1508897935) received approximately $79K in total Medicare Part B payments, serving 325 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1508897935

Errol GrannumMD

OphthalmologyMcallen, TXI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,046

Unique beneficiaries

—

Total services

1,546

Distinct HCPCS

Medicare payment

$66K

Peer benchmark

Total Medicare services vs. 1,238 Ophthalmology providers in TX — above median (cohort median 1,864).

PRESCRIBING · PART D · 2024

Total Rx claims

9,406

Beneficiaries

—

Total drug cost

$1.0M

Distinct drugs

Brand share

41.5%

Top prescribed drugs

Latanoprost2,675 claims

Brimonidine Tartrate805 claims

Erythromycin Base706 claims

Brimonidine Tartrate/Timolol626 claims

Timolol Maleate600 claims

QUALITY · MIPS · 2024

Final MIPS score

75.0

Quality

0.0

Cost

0.0

Improvement activities

0.0

Promoting interop.

0.0

Payment adjustment

0.00%

Individual

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$318

Payment records

By payment type

Food and Beverage$318

Top paying entities

Food and Beverage$318

REFERRAL NETWORK

Where Errol Grannum's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 5 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
DOCTORS HOSPITAL AT RENAISSANCE, LTD	95	183
Clinical Pathology Laboratories, Inc. Clinical Laboratory · Austin, TX	25	39
VHS HARLINGEN HOSPITAL COMPANY LLC	19	34
Michelle Cisneros Optometry · Odessa, TX	13	18
VALLEY BAPTIST AMBULATORY SURGERY CENTER, LLC	13	17

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events