Karen Lin, O.D.
NPI 1831241801 · Optometrist · Irvine, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Lin, O.D. is a Optometrist provider in Irvine, CA (NPI 1831241801).
Provider details
- NPI number
- 1831241801
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- OPT12328TPA (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
207 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 207 | $107 |
Typical Medicare-allowed amounts for these services range $107–$107 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 2575 Yorba Linda BlvdFullerton, CA 92831-1615Phone: (714) 449-7401Fax: (714) 992-7850
Registry dates
- Enumerated
- 2007-01-18
- Last updated
- 2023-12-22
- Certified
- 2023-03-07
Frequently asked questions
- What is Karen Lin's NPI number?
- Karen Lin's National Provider Identifier (NPI) is 1831241801, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Lin's specialty?
- Karen Lin is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Karen Lin located?
- Karen Lin's practice location on file with NPPES is 850 Health Sciences Rd, Irvine, CA 92617-3058.
- What is Karen Lin's phone number?
- The practice phone number listed in the NPPES registry for Karen Lin is (949) 824-2020.
- Does Karen Lin accept Medicare?
- Karen Lin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Lin's NPI active?
- Yes — Karen Lin's NPI (1831241801) is active in the NPPES registry as of the last update on 2023-12-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.