Doctor profile · Federal record
Dr. Errol Grannum, MD
Ophthalmology Physician (CMS: Ophthalmology) · McAllen, TX
- NPI 1508897935
- Accepts Medicare
- MIPS 0.0 / 100 · 2023
- 37 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
1910 S 1St St
McAllen, TX 785031255
(956) 687-3937
fax (956) 687-3938
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 1989 — 37 yrs since
- Specialty taxonomy
- 207W00000X — NUCC code
- State license (1)
- Texas #K5972
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1508897935. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,706
Distinct HCPCS
10
Medicare allowed
$108,493
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
92012 |
Established patient problem focused exam of visual system | 659 | 271 | $86 | |
92145 |
Measurement of corneal pressure | 332 | 202 | $12 | |
92083 |
Exam of visual field with extended testing | 169 | 147 | $60 | |
92020 |
Exam of the internal drainage system of eye | 147 | 144 | $27 | |
92133 |
Imaging of optic nerve | 143 | 136 | $33 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 84 | 84 | $160 | |
92250 |
Photography of the retina | 50 | 49 | $35 | |
65855 |
Laser repair to improve eye fluid flow | 31 | 21 | $234 | |
76514 |
Ultrasound scan of cornea to determine thickness | 30 | 30 | $10 | |
67820 |
Removal of eyelashes using forceps | 29 | 18 | $19 |
In context: peer comparison
Among 7 peers in McAllen Ophthalmology Physician, average services per provider: 202. This provider delivers 8.4× the peer median.Open Payments
Industry payments received
All-time total
$475
Transactions
23
Manufacturers
6
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 15 | $249.56 | |
| Bausch & Lomb Americas INC. | 4 | $142.57 | |
| Astellas Pharma US INC | 1 | $24.56 | |
| Tarsus Pharmaceuticals, INC. | 1 | $23.56 | |
| Sight Sciences, INC. | 1 | $18.99 | |
| Alcon Vision LLC | 1 | $15.95 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
7,177
Patients
2,074
Total drug cost
$754,734
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Latanoprost | Generic | 2,513 | 502 | $44,814 |
| Brimonidine Tartrate | Generic | 678 | 184 | $27,600 |
| Erythromycin (Erythromycin Base) | Brand | 597 | 285 | $7,446 |
| Combigan (Brimonidine Tartrate/Timolol) | Brand | 550 | 143 | $219,391 |
| Timolol Maleate | Generic | 459 | 135 | $7,810 |
| Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) | Brand | 428 | 111 | $13,543 |
| Dorzolamide Hcl | Generic | 301 | 77 | $8,198 |
| Lumigan (Bimatoprost) | Brand | 263 | 75 | $146,373 |
| Ciprofloxacin Hcl | Generic | 232 | 110 | $3,257 |
| Brimonidine Tartrate-Timolol (Brimonidine Tartrate/Timolol) | Brand | 228 | 86 | $62,904 |
Frequently asked questions
What is Dr. Errol Grannum's medical specialty?
Dr. Errol Grannum practices Ophthalmology Physician in McAllen, TX.
Where does Dr. Errol Grannum practice?
Dr. Errol Grannum practices at 1910 S 1St St, McAllen, TX 785031255. Office phone: 9566873937.
What is Dr. Errol Grannum's NPI?
Dr. Errol Grannum's National Provider Identifier (NPI) is 1508897935, issued by NPPES.
Does Dr. Errol Grannum accept Medicare assignment?
Yes. Dr. Errol Grannum accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Errol Grannum commonly perform?
Top Medicare-reported procedures in 2023: Established patient problem focused exam of visual system (HCPCS 92012); Measurement of corneal pressure (HCPCS 92145); Exam of visual field with extended testing (HCPCS 92083). Source: CMS Medicare Physician & Other Practitioners file.