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- 340 Rancheros Drive, Suites 164/166, San Marcos, CA 92069
About Dr. Guan
Howard Guan, M.D. practices ophthalmology — glaucoma in San Marcos, CA. Howard is a 2010 graduate of Loma Linda University School of Medicine. Howard is also listed as specializing in ophthalmology. According to Medicare claims data, Howard cared for 1,891 Medicare patients across 6,601 services. The services billed most often include injection, faricimab-svoa, 0.1 mg, visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient', and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. The provider's National Provider Identifier (NPI) is 1134427636.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (760) 598-0400
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
340 RANCHEROS DRIVE SUITES 164/166
San Marcos, CA 92069
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Eye injury and cancer
- Chemical injury to the eye
- Foreign body in the eye
- Hyphema
- Open-globe eye injury
Inflammation, neurologic, and orbit
- Optic neuritis
- Optic neuropathy
- Orbital cellulitis
- Thyroid eye disease
- Uveitis
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
- Epiretinal membrane
- Retinal detachment
Eye injuries
Retina & vitreous
Procedures & services
Cataract and lens
- Cataract surgery with lens implant
- Laser-assisted cataract surgery
- Intraocular lens exchange
- YAG laser capsulotomy
Cornea and refractive
- Endothelial corneal transplant
Emergency and minor
- Corneal rust-ring removal
- Removal of an eye foreign body
- Repair of an eye or eyelid laceration
- Repair of ruptured globe
Examination and imaging
- Eye ultrasound
- Slit-lamp examination
- Visual-field testing
- Corneal topography
- Fluorescein angiography
Eyelid, tear duct, and muscle
- Chalazion removal
- Ectropion repair
- Eyelid surgery
- Tear-duct probing
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Tear-duct bypass surgery
Glaucoma
- Cyclophotocoagulation
- Trabeculectomy
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Retina
- Macular hole surgery
- Pneumatic retinopexy
- Retinal laser treatment
- Scleral buckle surgery
- Vitrectomy
Most searched procedures
- Cataract surgery
- Eye exam
- LASIK
- Retina surgery
Corneal procedures
- Amniotic Membrane Eye Graft
Eye diagnostics
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
Laser eye surgery
- Laser Floater Removal
Laser procedures
- Laser Treatment for Retinal Tear
Laser vision correction
- SMILE Eye Surgery
Refractive surgery
- Clear Lens Exchange
- Implantable Contact Lenses
Tear duct & Orbit
- Orbital Decompression Surgery
- Tear Duct Plugs
Procedures Most Often Billed to Medicare
6,601 services · 1,891 patients · 17 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Closure of tear duct opening using plug | Procedure | 68761 |
106 | More often than most peers in Ophthalmology — Glaucoma |
| Injection of drug into eye | Procedure | 67028 |
84 | Too few peers to compare |
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
38 | Less often than most peers in Ophthalmology — Glaucoma |
| Laser repair to improve eye fluid flow | Procedure | 65855 |
26 | As often as other peers in Ophthalmology — Glaucoma |
| Ultrasound scan of cornea to determine thickness | Imaging | 76514 |
95 | More often than most peers in Ophthalmology — Glaucoma |
| Photography of the retina | Treatment | 92250 |
241 | More often than most peers in Ophthalmology — Glaucoma |
| Imaging of retina | Treatment | 92134 |
225 | More often than most peers in Ophthalmology — Glaucoma |
| Imaging of optic nerve | Treatment | 92133 |
165 | As often as other peers in Ophthalmology — Glaucoma |
| Exam of visual field with extended testing | Treatment | 92083 |
159 | As often as other peers in Ophthalmology — Glaucoma |
| Exam of the internal drainage system of eye | Treatment | 92020 |
103 | More often than most peers in Ophthalmology — Glaucoma |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Loma Linda University School of Medicine 2
Other providers in the same specialty who trained at the same institution.
Class of 2010 at Loma Linda University School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Closure of tear duct opening using plug 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Howard Guan specialize in?
Howard Guan is an eye doctor in San Marcos, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology — Glaucoma”.
NPI registry
Where is Howard Guan located?
Howard Guan is listed at 340 Rancheros Drive Suites 164/166, San Marcos, CA 92069. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Howard Guan's phone number?
The number on file is (760) 598-0400. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Howard Guan's NPI number?
Howard Guan's National Provider Identifier is 1134427636. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Howard Guan train?
Howard Guan attended Loma Linda University School of Medicine, graduating in 2010. This comes from the CMS National Downloadable File.
CMS public data
How long has Howard Guan been practicing?
Howard Guan has 16 years experience. Calculated from a graduation year of 2010, reported in the CMS National Downloadable File.
CMS public data
What does Howard Guan do most often?
According to Medicare billing data, Howard Guan performs procedures including closure of tear duct opening using plug, injection of drug into eye and removal of cataract with insertion of prosthetic lens; reads or performs imaging such as ultrasound scan of cornea to determine thickness; provides treatments such as photography of the retina and imaging of retina, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Howard Guan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Howard Guan. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.