Chi Mong Or, MD
NPI 1639676000 · Ophthalmology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chi Mong Or, MD is a Ophthalmology Physician provider in Stanford, CA (NPI 1639676000).
Provider details
- NPI number
- 1639676000
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A172845 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,045 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 577 | $146 |
| Imaging of Retina92134 | 395 | $35 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 188 | $111 |
| Established Patient Complete Exam of Visual System92014 | 175 | $150 |
| Imaging of Optic Nerve92133 | 150 | $36 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 99 | $195 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 258 | 90 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 155 | 56 |
| Prednisolone Acetate | 54 | 36 |
| Prednisone | 40 | 14 |
| Brimonidine Tartrate | 31 | 13 |
| Cyclosporinebrand: Restasis | 30 | 12 |
| Dorzolamide Hcl | 29 | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,724 across 33 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 31 Massachusetts Ave Apt B4Boston, MA 02115-1408Phone: (857) 319-5544
Registry dates
- Enumerated
- 2018-04-11
- Last updated
- 2025-11-21
- Certified
- 2025-11-21
Frequently asked questions
- What is Chi Mong Or's NPI number?
- Chi Mong Or's National Provider Identifier (NPI) is 1639676000, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chi Mong Or's specialty?
- Chi Mong Or is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Chi Mong Or located?
- Chi Mong Or's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Chi Mong Or's phone number?
- The practice phone number listed in the NPPES registry for Chi Mong Or is (650) 723-4000.
- Does Chi Mong Or accept Medicare?
- Chi Mong Or is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chi Mong Or's NPI active?
- Yes — Chi Mong Or's NPI (1639676000) is active in the NPPES registry as of the last update on 2025-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.