NPPES file of Aug 9, 2026

Karisa Ann Jahn, D.O.

Geriatric Medicine (Family Medicine) Physician · Fontana, CA

Karisa Ann Jahn, D.O. is a geriatric medicine (family medicine) physician with a practice address in Fontana, California, and NPI 1346531027, issued on Apr 28, 2011. Check the license (California A11079, 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
1346531027
Name
Karisa Ann Jahn
Credential
D.O.
Primary taxonomy
Geriatric Medicine (Family Medicine) Physician 207QG0300X
License number
A11079 CA
Self-reported in NPPES; status is on the state search
Practice location
9961 Sierra Ave, Fontana, CA 92335
Phone
(909) 609-3500
Enumerated
Apr 28, 2011
Record last updated
Dec 3, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20120919000296); accepts Medicare assignment
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 geriatric medicine (family medicine) physician records → All 243 in California → Look up another NPI →

Also registered at 9961 Sierra Ave

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

  1. Solomon Abila, MDFamily Medicine Physician1871652479
  2. Jenny Abouelsood, M.D.Family Medicine Physician1457638512
  3. Marla Abrolat, MDPediatrics Physician1164593133
  4. Eduardo Acosta, MDPediatrics Physician1497803324
  5. Michael Adair, MDFamily Medicine Physician1780732651
  6. Berneva Adams, MDObstetrics & Gynecology Physician1376602987

Verify Karisa Ann Jahn in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A11079    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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89% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024

599 Medicare Part D claims for 143 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims. 378 claims were for opioids.

  1. Karisa Jahn599
  2. Specialty average5,222

Most prescribed

  1. Hydrocodone-Acetaminophen115 claims
  2. Hydromorphone Hcl78 claims
  3. Ondansetron Hcl64 claims
  4. Fentanyl57 claims
  5. Morphine Sulfate Er46 claims
  6. Oxycodone-Acetaminophen40 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.

Bills Medicare through one group practice

  1. Southern California Permanente Medical GroupRiverside, CA

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

Karisa Ann Jahn among 243 geriatric medicine (family medicine) physician records in California

Karisa Ann Jahn, D.O. is one of 243 geriatric medicine (family medicine) physician records with a practice address in California. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 73% of them.

  • NPI issued2011 · 73% of these records are older, 22% newer
  • In a Medicare fileYes · 76% of these records are
  • In the CMS Doctors and Clinicians fileYes · 46% of these records are
  • Graduated2008 · median 2004 among the 111 with a school on file
  • Record last updated2021 · 69% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Family Medicine) Physician providers in California

There are 243 geriatric medicine (family medicine) physician records in California.

All 243 in California → Every provider in Fontana → Geriatric Medicine (Family Medicine) Physician nationwide →

The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes

  1. Kent Ahn, MDFontana, CA 923351083762017
  2. Israel Coutin, MDFontana, CA 923351790852663
  3. Juanito Garlitos, MDFontana, CA 923351780751644
  4. Kamal Kejriwal, MDFontana, CA 923351336210392
  5. Helen Lee, MDFontana, CA 923351336210244
  6. Norman Ragaza, MDFontana, CA 923351508925249
  7. Ruby Singh, DOFontana, CA 923351083766463
  8. Esther Won, MDFontana, CA 923351902973803

Common questions

What is Karisa Ann Jahn, D.O.'s NPI number?

Karisa Ann Jahn, D.O.'s National Provider Identifier (NPI) is 1346531027, issued on Apr 28, 2011. An NPI identifies a provider in billing; it is not a license.

Where is Karisa Ann Jahn, D.O. located?

The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 609-3500. Providers update this record themselves, so call before visiting.

How can I verify Karisa Ann Jahn, D.O.'s license?

NPPES lists California license number A11079, 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 Karisa Ann Jahn, D.O. prescribe under Medicare Part D?

In 2024, Karisa Ann Jahn, D.O. had 599 Medicare Part D claims for 143 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.