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Edit this profileAt a glance
- 855 W Foothill Blvd, Monrovia, CA 91016
About Dr. Ong
Based in Monrovia, CA, Olivia C. Ong, MD is listed in the NPI registry under ophthalmology — glaucoma. Olivia graduated from University of California, Geffen School of Medicine in 1997. Olivia is also listed as specializing in ophthalmology. According to Medicare claims data, Olivia cared for 218 Medicare patients across 256 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and imaging of optic nerve. NPI 1124021688 identifies this record in the national registry.
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
- (626) 358-1080
- Email not available
Practice Locations
855 W FOOTHILL BLVD
Monrovia, CA 91016
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
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
Inflammation, neurologic, and orbit
- Thyroid eye disease
- Uveitis
Retina & vitreous
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
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
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
256 services · 218 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
32 | Less often than most peers in Ophthalmology — Glaucoma |
| Imaging of optic nerve | Treatment | 92133 |
34 | Less often than most peers in Ophthalmology — Glaucoma |
| Imaging of retina | Treatment | 92134 |
19 | Less often than most peers in Ophthalmology — Glaucoma |
| Exam of visual field with extended testing | Treatment | 92083 |
14 | Less often than most peers in Ophthalmology — Glaucoma |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
114 | As often as other peers in Ophthalmology — Glaucoma |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
43 | Less 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.
Related specialists at this location 7
Clinically related specialties at the same address — the people this provider most likely works alongside.
Trained at University of California, Geffen School of Medicine 1
Other providers in the same specialty who trained at the same institution.
Class of 1997 at University of California, Geffen 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 Removal of cataract with insertion of prosthetic lens 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Dr. Ong's specialty?
Dr. Ong is an eye doctor in Monrovia, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology — Glaucoma”.
NPI registry
Where can I find Dr. Ong?
Dr. Ong is listed at 855 W Foothill Blvd, Monrovia, CA 91016. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Ong?
The number on file is (626) 358-1080. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Ong's NPI number?
Dr. Ong's National Provider Identifier is 1124021688. 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
What is Dr. Ong's medical education?
Dr. Ong attended University of California, Geffen School of Medicine, graduating in 1997. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Ong been practicing?
Dr. Ong has 29 years experience. Calculated from a graduation year of 1997, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Ong known for?
According to Medicare billing data, Dr. Ong performs procedures including removal of cataract with insertion of prosthetic lens; provides treatments such as imaging of optic nerve 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 Dr. Ong confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Ong. If this is you, claiming it is free.
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Guide.md listings do not constitute medical advice or an endorsement.