Katherine Mariko Tanaka, M.D.
Ophthalmology Physician · Long Beach, CA
Katherine Mariko Tanaka, M.D. is an ophthalmology physician with a practice address in Long Beach, California, and NPI 1336344878, issued on Jun 15, 2007. Check the license (California G58916, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katherine Mariko Tanaka
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G58916 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5512 E Britton Dr Ste 200, Long Beach, CA 90815
- Phone
- (562) 421-2020
- Enumerated
- Jun 15, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050615000356); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1986
- Entity
- Type 1 · individual
Also registered at 5512 E Britton Dr Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jill Gould Pajaud, O.D.Optometrist1184700650
- Christine Terada, O.D.Optometrist1275619827
Verify Katherine Mariko Tanaka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G58916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
89% fewer Medicare Part D claims than the average ophthalmology physician in 2024
160 Medicare Part D claims for 44 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 71% of claims.
Most prescribed
- Restasis37 claims
- Lumigan27 claims
- Cosopt Pf12 claims
- Latanoprost12 claims
- Dorzolamide-Timolol11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $18.88
1 payment: food and beverage; the largest payer was Abbvie Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Katherine M Tanaka MD IncLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
Other ophthalmology physician records in California
- Sam Abbassi, MD, MSWest Hills, CA1881937720
- Richard Abbott, M.D.San Francisco, CA1346276573
- Jean-Paul Abboud, M.D., PH.D.Del Mar, CA1760776728
- Nizar Abdelfattah, MDPasadena, CA1801359393
- Parastou Abedi, MDAliso Viejo, CA1720067333
- Shahla Abedi, MDAliso Viejo, CA1467431072
- Lilit Ablabutyan, M.D.Glendale, CA1497013064
- Nathan Abraham, M.D.Valencia, CA1306224456
- James Abrams, M.D.San Bruno, CA1912903329
- Adam Abroms, MDWestlake Village, CA1497743702
Common questions
What is Katherine Mariko Tanaka, M.D.'s NPI number?
Katherine Mariko Tanaka, M.D.'s National Provider Identifier (NPI) is 1336344878, issued on Jun 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Mariko Tanaka, M.D. located?
The NPPES record lists a practice address at 5512 E Britton Dr Ste 200, Long Beach, CA, 90815. Phone: (562) 421-2020. Providers update this record themselves, so call before visiting.
How can I verify Katherine Mariko Tanaka, M.D.'s license?
NPPES lists California license number G58916, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Mariko Tanaka, M.D. prescribe under Medicare Part D?
In 2024, Katherine Mariko Tanaka, M.D. had 160 Medicare Part D claims for 44 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.