Irving Gan, O.D.
NPI 1679792683 · Optometrist · Frederick, MD
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irving Gan, O.D. is a Optometrist provider in Frederick, MD (NPI 1679792683).
Provider details
- NPI number
- 1679792683
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- TA1469 (MD)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$121 across 5 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
Registry dates
- Enumerated
- 2007-04-25
- Last updated
- 2010-05-27
Frequently asked questions
- What is Irving Gan's NPI number?
- Irving Gan's National Provider Identifier (NPI) is 1679792683, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irving Gan's specialty?
- Irving Gan is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Irving Gan located?
- Irving Gan's practice location on file with NPPES is 8925 Fingerboard Rd, Frederick, MD 21704-8163.
- What is Irving Gan's phone number?
- The practice phone number listed in the NPPES registry for Irving Gan is (301) 810-5104.
- Does Irving Gan accept Medicare?
- Irving Gan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irving Gan's NPI active?
- Yes — Irving Gan's NPI (1679792683) is active in the NPPES registry as of the last update on 2010-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.