Physician Profile
Howard Guan, M.D.
Unclaimed ProfileAbout Dr. Guan
Howard Guan, M.D. practices ophthalmology in San Marcos, CA. Howard is a 2010 graduate of Loma Linda University School of Medicine. Howard is also listed as specializing in ophthalmology — glaucoma. According to Medicare claims data, Howard cared for 1,891 Medicare patients across 6,601 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (760) 598-0400
- Email not available
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
Most searched conditions
- Cataracts
- Diabetic retinopathy
- Dry eye
- Glaucoma
- Macular degeneration
Cornea and external eye
- Blepharitis
- Corneal abrasion
- Corneal ulcer
- Keratoconus
- Pink eye
- Pterygium
Eyelid and tear drainage
- Blocked tear duct
- Chalazion
- Drooping eyelid
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
- Epiretinal membrane
- Retinal detachment
Eye injuries
- Foreign Object in Eye
Inflammation, neurologic, and orbit
- Thyroid eye disease
- Uveitis
Retina & vitreous
- Eye Floaters and Flashes
Procedures & services
Most searched procedures
- Cataract surgery
- Eye exam
- LASIK
- Retina surgery
Examination and imaging
- Corneal topography
- Fluorescein angiography
Cataract and lens
- Intraocular lens exchange
- YAG laser capsulotomy
Corneal procedures
- Amniotic Membrane Eye Graft
Eye diagnostics
- Optical Coherence Tomography Scan
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
- Stye Removal
Eyelid, tear duct, and muscle
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Eyelid surgery
- Tear-duct bypass surgery
Glaucoma
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
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 |
|---|---|---|---|
| Closure of tear duct opening using plug | Procedure | 68761 |
106 |
| Injection of drug into eye | Procedure | 67028 |
84 |
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
38 |
| Laser repair to improve eye fluid flow | Procedure | 65855 |
26 |
| Ultrasound scan of cornea to determine thickness | Imaging | 76514 |
95 |
| Photography of the retina | Treatment | 92250 |
241 |
| Imaging of retina | Treatment | 92134 |
225 |
| Imaging of optic nerve | Treatment | 92133 |
165 |
| Exam of visual field with extended testing | Treatment | 92083 |
159 |
| Exam of the internal drainage system of eye | Treatment | 92020 |
103 |
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.
Other ophthalmology specialists in San Marcos 2
Same specialty, same city.
Trained at Loma Linda University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2010 at Loma Linda University School of Medicine 8
Providers who graduated from the same medical school in the same year.
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 ophthalmology in San Marcos, CA. That is the designation recorded for this NPI in the federal registry.
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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.