NPPES file of Aug 9, 2026

Nancy J. Councelbaum, MD

Geriatric Medicine (Internal Medicine) Physician · Irvine, CA

Nancy J. Councelbaum, MD is a geriatric medicine (internal medicine) physician with a practice address in Irvine, California, and NPI 1275635013, issued on Sep 2, 2006. Check the license (California G57005, 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
1275635013
Name
Nancy J. Councelbaum
Credential
MD
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
G57005 CA
Self-reported in NPPES; status is on the state search
Practice location
16300 Sand Canyon Ave, Irvine, CA 92618
Phone
(949) 753-7475
Enumerated
Sep 2, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(949) 753-8797
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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Also registered at 16300 Sand Canyon Ave

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

  1. Donald Altman, MDPlastic and Reconstructive Surgery Physician1285748517
  2. Robert Baird, M.D.Orthopaedic Surgery Physician1669480984
  3. Anna Marie Bantigue, NPNurse Practitioner1831315068
  4. Howard Conn, MDOphthalmology Physician1245282540
  5. Anh Dinh, MDFamily Medicine Physician1790775971
  6. John Dougherty, P.T.A., A.,T.,C.Physical Therapy Assistant1396823845

Verify Nancy J. Councelbaum in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G57005    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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15% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

4,868 Medicare Part D claims for 583 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.

  1. Nancy Councelbaum4,868
  2. Specialty average4,246

Most prescribed

  1. Levothyroxine Sodium452 claims
  2. Atorvastatin Calcium332 claims
  3. Losartan Potassium320 claims
  4. Rosuvastatin Calcium302 claims
  5. Amlodipine Besylate266 claims
  6. Escitalopram Oxalate161 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.

Geriatric Medicine (Internal Medicine) Physician providers in California

There are 532 geriatric medicine (internal medicine) physician records in California.

All 532 in California → Every provider in Irvine →

Other geriatric medicine (internal medicine) physician records in California

  1. Adil Abbasi, M.D.La Jolla, CA1548261316
  2. Shashidar Acharya, M.D.Orange, CA1770685521
  3. Marie AdachiLos Angeles, CA1629496740
  4. Pouya Afshar, M.D.San Diego, CA1184958977
  5. Parag Agnihotri, M.D.San Diego, CA1447351085
  6. Andreas Ahlas, M.D.Bakersfield, CA1326200833
  7. Waseem Ahmed, MDSanta Rosa, CA1386803559
  8. Paul AisenSan Diego, CA1669470753
  9. Mahmuda Alam, M.D.Glendale, CA1568659985
  10. Cathy Alessi, M.D.North Hills, CA1134224983

Common questions

What is Nancy J. Councelbaum, MD's NPI number?

Nancy J. Councelbaum, MD's National Provider Identifier (NPI) is 1275635013, issued on Sep 2, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Nancy J. Councelbaum, MD located?

The NPPES record lists a practice address at 16300 Sand Canyon Ave, Irvine, CA, 92618. Phone: (949) 753-7475. Providers update this record themselves, so call before visiting.

How can I verify Nancy J. Councelbaum, MD's license?

NPPES lists California license number G57005, 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 Nancy J. Councelbaum, MD prescribe under Medicare Part D?

In 2024, Nancy J. Councelbaum, MD had 4,868 Medicare Part D claims for 583 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.