NPPES file of Aug 9, 2026

Martha E. Hierro, M.D.

Gastroenterology Physician · Santa Monica, CA

Martha E. Hierro, M.D. is a gastroenterology physician with a practice address in Santa Monica, California, and NPI 1770562431, issued on Jan 11, 2006. Check the license (California G65495, 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
1770562431
Name
Martha E. Hierro
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
G65495 CA
Self-reported in NPPES; status is on the state search
Practice location
2021 Santa Monica Blvd, Santa Monica, CA 90404
Phone
(310) 471-9917
Enumerated
Jan 11, 2006
Record last updated
Aug 25, 2020 (not updated in 6 years: call before relying on the address or phone)
Fax
(310) 319-2468
Medicaid ID
00G654950 CA
Medicare enrollment
Enrolled (PECOS I20101228000331); accepts Medicare assignment
Medical or professional school
University Of California, Geffen School Of Medicine, 1987
Telehealth
Offers telehealth (CMS)
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 gastroenterology physician records → All 2,140 in California → Look up another NPI →

Also registered at 2021 Santa Monica Blvd

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

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  4. Dino Deconcini, MDUrology Physician1689666307
  5. Bella DoshiDentist1023326238
  6. Joan Feltman, M.D.Internal Medicine Physician1053418640

Verify Martha E. Hierro in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G65495    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

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67% fewer Medicare Part D claims than the average gastroenterology physician in 2024

269 Medicare Part D claims for 86 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.

  1. Martha Hierro269
  2. Specialty average811

Most prescribed

  1. Pantoprazole Sodium82 claims
  2. Famotidine54 claims
  3. Omeprazole25 claims
  4. Creon15 claims
  5. Dicyclomine Hcl13 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: $80.86

4 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Martha Hierro$80.86
  2. Specialty average$5,015.95

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

Martha E. Hierro among 2,140 gastroenterology physician records in California

Martha E. Hierro, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% 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 7% of them.

  • NPI issued2006 · 7% of these records are older, 48% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 72% of these records are
  • Graduated1987 · median 2002 among the 1,538 with a school on file
  • Record last updated2020 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Gastroenterology Physician providers in California

There are 2,140 gastroenterology physician records in California.

All 2,140 in California → Every provider in Santa Monica → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Parviz Afshani, M.D.Santa Monica, CA 904041083693766
  2. Rudolph Bedford, M.D.Santa Monica, CA 904041902885684
  3. Richard Corlin, M.D.Santa Monica, CA 904041649259268
  4. Nathan Elson, M.D.Santa Monica, CA 904041750388526
  5. Charles Frankel, M.D.Santa Monica, CA 904041558310805
  6. Marc Harwitt, M.D.Santa Monica, CA 904041285613943
  7. Jerome Helman, MDSanta Monica, CA 904041093876831
  8. Danice Hertz, M.D.Santa Monica, CA 904041760431027

Common questions

What is Martha E. Hierro, M.D.'s NPI number?

Martha E. Hierro, M.D.'s National Provider Identifier (NPI) is 1770562431, issued on Jan 11, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Martha E. Hierro, M.D. located?

The NPPES record lists a practice address at 2021 Santa Monica Blvd, Santa Monica, CA, 90404. Phone: (310) 471-9917. Providers update this record themselves, so call before visiting.

How can I verify Martha E. Hierro, M.D.'s license?

NPPES lists California license number G65495, 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 Martha E. Hierro, M.D. prescribe under Medicare Part D?

In 2024, Martha E. Hierro, M.D. had 269 Medicare Part D claims for 86 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.

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.