NPPES file of Aug 9, 2026

Catherine S. Mao, M.D.

Pediatric Endocrinology Physician · Torrance, CA

Catherine S. Mao, M.D. is a pediatric endocrinology physician with a practice address in Torrance, California, and NPI 1073567236, issued on May 20, 2006. Check the license (California A51970, 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 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1073567236
Name
Catherine S. Mao
Credential
M.D.
Primary taxonomy
Pediatric Endocrinology Physician 2080P0205X
License number
A51970 CA
Self-reported in NPPES; status is on the state search
Practice location
21840 Normandie Ave, Torrance, CA 90502
Phone
(310) 222-5133
Enumerated
May 20, 2006
Record last updated
Jul 23, 2019 (not updated in 7 years: call before relying on the address or phone)
Fax
(310) 781-9352
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest pediatric endocrinology physician records → All 207 in California → Look up another NPI →

Also registered at 21840 Normandie Ave

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

  1. Sudhir Anand, M.D.Pediatric Nephrology Physician1750360426
  2. Thomas Anderson, MDNeurology Physician1750304234
  3. Morris Asch, M.D.Pediatric Surgery Physician1619957784
  4. Lilly Barba, M.D.Nephrology Physician1407835978
  5. Peter Barrett, M.D.Internal Medicine Physician1568441954
  6. Barry Baylen, M.D.Pediatric Cardiology Physician1346229879

Verify Catherine S. Mao in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A51970    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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Industry payments in 2024: $32.05

1 payment: food and beverage; the largest payer was Regeneron Healthcare Solutions, Inc. The 931 providers of this specialty with any payment received $4,382.94 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Catherine Mao$32.05
  2. Specialty average$4,382.94

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Catherine S. Mao among 207 pediatric endocrinology physician records in California

Catherine S. Mao, M.D. is one of 207 pediatric endocrinology physician records with a practice address in California. 63% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.

  • NPI issued2006 · 6% of these records are older, 61% newer
  • In a Medicare fileYes · 63% of these records are
  • In the CMS Doctors and Clinicians fileNo · 23% of these records are
  • Record last updated2019 · 56% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0205X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Pediatric Endocrinology Physician providers in California

There are 207 pediatric endocrinology physician records in California.

All 207 in California → Every provider in Torrance → Pediatric Endocrinology Physician nationwide →

The 8 pediatric endocrinology physician records with the nearest ZIP codes

  1. Jennifer Yee, MDTorrance, CA 905021275725418
  2. Suparna Jain, M.D.Santa Monica, CA 904011053536458
  3. Ann Kershnar, MDBellflower, CA 907061013065093
  4. Audrey Briscoe, M.D.Downey, CA 902421306017421
  5. Alan Klein, MDBeverly Hills, CA 902111871631069
  6. Juliana Austin, MDLong Beach, CA 908061689672909
  7. Amrit Bhangoo, MDLong Beach, CA 908061982882254
  8. Mario Brakin, MDLong Beach, CA 908061215921028

Common questions

What is Catherine S. Mao, M.D.'s NPI number?

Catherine S. Mao, M.D.'s National Provider Identifier (NPI) is 1073567236, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Catherine S. Mao, M.D. located?

The NPPES record lists a practice address at 21840 Normandie Ave, Torrance, CA, 90502. Phone: (310) 222-5133. Providers update this record themselves, so call before visiting.

How can I verify Catherine S. Mao, M.D.'s license?

NPPES lists California license number A51970, 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.