Karen Ma, O.D.
NPI 1639441082 · Optometrist · Sacramento, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Ma, O.D. is a Optometrist provider in Sacramento, CA (NPI 1639441082).
Provider details
- NPI number
- 1639441082
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 14350 (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 tenure38% of score
14 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 96 | 48 |
| Cyclosporine | 67 | 35 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 44 | 12 |
| Timolol Maleate | 33 | 13 |
| Dorzolamide Hcl | 23 | — |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 16 | — |
| Prednisolone Acetate | 13 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-02-01
- Last updated
- 2022-01-18
- Certified
- 2022-01-18
Frequently asked questions
- What is Karen Ma's NPI number?
- Karen Ma's National Provider Identifier (NPI) is 1639441082, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Ma's specialty?
- Karen Ma is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Karen Ma located?
- Karen Ma's practice location on file with NPPES is 5901 Florin Rd, Sacramento, CA 95823-2302.
- What is Karen Ma's phone number?
- The practice phone number listed in the NPPES registry for Karen Ma is (916) 394-1248.
- Does Karen Ma accept Medicare?
- Karen Ma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Ma's NPI active?
- Yes — Karen Ma's NPI (1639441082) is active in the NPPES registry as of the last update on 2022-01-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.