Doctor profile · Federal record
Dr. Howard Guan, M.D.
Glaucoma Specialist (Ophthalmology) Physician (CMS: Ophthalmology) · Ophthalmology Physician · San Marcos, CA
- NPI 1134427636
- Accepts Medicare
- MIPS 76.4 / 100 · 2023
- 16 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
340 Rancheros Drive, Suites 164/166
San Marcos, CA 92069
(760) 598-0400
fax (760) 290-7044
Credentials & registration
- NPI registered
- March 2011 — 15 yrs on file
- Profile last updated
- October 21, 2025
- Year of graduation
- 2010 — 16 yrs since
- Specialty taxonomy
- 207WX0009X — NUCC code
- State license (1)
- California #A119766
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1134427636. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,521
Distinct HCPCS
10
Medicare allowed
$263,248
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J2777 |
Injection, faricimab-svoa, 0.1 mg | 1,500 | 11 | $36 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 647 | 510 | $133 | |
92133 |
Imaging of optic nerve | 243 | 237 | $38 | |
92083 |
Exam of visual field with extended testing | 199 | 192 | $67 | |
92250 |
Photography of the retina | 147 | 144 | $41 | |
92134 |
Imaging of retina | 122 | 106 | $44 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 116 | 99 | $95 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 81 | 81 | $176 | |
92020 |
Exam of the internal drainage system of eye | 78 | 77 | $30 | |
92014 |
Established patient complete exam of visual system | 53 | 53 | $131 |
In context: peer comparison
Among 1 peers in San Marcos Glaucoma Specialist (Ophthalmology) Physician, average services per provider: 195. This provider delivers 18× the peer median.Open Payments
Industry payments received
All-time total
$946
Transactions
22
Manufacturers
7
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 13 | $425.91 | |
| Dompe US, INC. | 3 | $172.22 | |
| Carl Zeiss Meditec USA, INC. | 2 | $167.73 | |
| Sight Sciences, INC. | 1 | $120.00 | |
| Apellis Pharmaceuticals, INC. | 1 | $28.73 | |
| Boston Scientific Corporation | 1 | $16.98 | |
| Alcon Vision LLC | 1 | $14.49 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
4,986
Patients
1,598
Total drug cost
$354,333
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Latanoprost | Generic | 1,625 | 442 | $44,145 |
| Brimonidine Tartrate | Generic | 851 | 234 | $28,824 |
| Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) | Brand | 766 | 204 | $25,733 |
| Timolol Maleate | Generic | 500 | 165 | $13,954 |
| Dorzolamide Hcl | Generic | 301 | 84 | $11,281 |
| Prednisolone Acetate | Generic | 196 | 134 | $11,552 |
| Alphagan P (Brimonidine Tartrate) | Brand | 144 | 47 | $65,729 |
| Diclofenac Sodium | Generic | 143 | 112 | $1,805 |
| Lumigan (Bimatoprost) | Brand | 95 | 29 | $44,343 |
| Rhopressa (Netarsudil Mesylate) | Brand | 79 | 29 | $43,930 |
Frequently asked questions
What is Dr. Howard Guan's medical specialty?
Dr. Howard Guan practices Glaucoma Specialist (Ophthalmology) Physician in San Marcos, CA.
Where does Dr. Howard Guan practice?
Dr. Howard Guan practices at 340 Rancheros Drive, San Marcos, CA 92069. Office phone: 7605980400.
What is Dr. Howard Guan's NPI?
Dr. Howard Guan's National Provider Identifier (NPI) is 1134427636, issued by NPPES.
Does Dr. Howard Guan accept Medicare assignment?
Yes. Dr. Howard Guan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Howard Guan commonly perform?
Top Medicare-reported procedures in 2023: Injection, faricimab-svoa, 0.1 mg (HCPCS J2777); Established patient office or other outpatient visit (HCPCS 99214); Imaging of optic nerve (HCPCS 92133). Source: CMS Medicare Physician & Other Practitioners file.