NPPES file of Aug 9, 2026

Aki Niihara, M.D.

Obstetrics & Gynecology Physician · Lancaster, CA

Aki Niihara, M.D. is an obstetrics & gynecology physician with a practice address in Lancaster, California, and NPI 1114286952, issued on May 14, 2012. Check the license (California A128800, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1114286952
Name
Aki Niihara
Credential
M.D.
Primary taxonomy
Obstetrics & Gynecology Physician 207V00000X
License number
A128800 CA
Self-reported in NPPES; status is on the state search
Practice location
335 E Avenue I, Lancaster, CA 93535
Phone
(323) 243-2214
Enumerated
May 14, 2012
Record last updated
Jun 16, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20161026000964); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →

Also registered at 335 E Avenue I

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Angela AcainAmbulatory Care Registered Nurse1104791516
  2. Leila Adriano, RNRegistered Nurse1558883421
  3. Gyanesh Agrawal, M.D.Internal Medicine Physician1366587768
  4. Arnulfo Alvarado Cruz, RNRegistered Nurse1093682155
  5. Laura Avalos De AyalaAmbulatory Care Registered Nurse1043732282
  6. Carina BarocioCase Manager/Care Coordinator1780420752

Verify Aki Niihara in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A128800    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. County OF Los AngelesLancaster, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Aki Niihara among 5,088 obstetrics & gynecology physician records in California

Aki Niihara, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 75% of them.

  • NPI issued2012 · 75% of these records are older, 22% newer
  • In a Medicare fileYes · 74% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated2012 · median 2004 among the 2,700 with a school on file
  • Record last updated2020 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Obstetrics & Gynecology Physician providers in California

There are 5,088 obstetrics & gynecology physician records in California.

All 5,088 in California → Every provider in Lancaster → Obstetrics & Gynecology Physician nationwide →

The 8 obstetrics & gynecology physician records with the nearest ZIP codes

  1. Sam Allen, MDLancaster, CA 935341982740841
  2. Herminia Amezcua, MDLancaster, CA 935341326282385
  3. Katrina Baker, MDLancaster, CA 935341538154836
  4. John Birsner, MDLancaster, CA 935341457443525
  5. Oluwamuyiwa Bolonduro, M.DLancaster, CA 935341215216965
  6. Suzanne Chaudhry, M.D.Lancaster, CA 935341730223066
  7. Alex Danso, MDLancaster, CA 935341972611655
  8. Jackson Fu, MDLancaster, CA 935341871581637

Common questions

What is Aki Niihara, M.D.'s NPI number?

Aki Niihara, M.D.'s National Provider Identifier (NPI) is 1114286952, issued on May 14, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Aki Niihara, M.D. located?

The NPPES record lists a practice address at 335 E Avenue I, Lancaster, CA, 93535. Phone: (323) 243-2214. Providers update this record themselves, so call before visiting.

How can I verify Aki Niihara, M.D.'s license?

NPPES lists California license number A128800, 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.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.