NPPES file of Aug 9, 2026

Karen Isak, RN

Certified Registered Nurse Anesthetist · Fresno, CA

Karen Isak, RN is a certified registered nurse anesthetist with a practice address in Fresno, California, and NPI 1174394274, issued on Jan 9, 2024. Check the license (California 157471, as entered in NPPES) with the California board that licenses this profession; 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
1174394274
Name
Karen Isak
Credential
RN
Primary taxonomy
Certified Registered Nurse Anesthetist 367500000X
License number
157471 CA
Self-reported in NPPES; status is on the state search
Practice location
20 River Park PL W Fresno CA 93720, Fresno, CA 93724
Phone
(916) 202-6761
Enumerated
Jan 9, 2024
Record last updated
Feb 10, 2026
Medicare enrollment
Enrolled (PECOS I20260313000613); 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 certified registered nurse anesthetist records → All 2,943 in California → Look up another NPI →

Verify Karen Isak in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license 157471    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
Find the California license search

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Bills Medicare through one group practice

  1. Valley Regional Anesthesia Associates IncManteca, CA

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

Karen Isak among 2,943 certified registered nurse anesthetist records in California

Karen Isak, RN is one of 2,943 certified registered nurse anesthetist records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 93% of them.

  • NPI issued2024 · 93% of these records are older, 3% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2025 · median 2016 among the 2,089 with a school on file
  • Record last updated2026 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 367500000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Certified Registered Nurse Anesthetist providers in California

There are 2,943 certified registered nurse anesthetist records in California.

All 2,943 in California → Every provider in Fresno → Certified Registered Nurse Anesthetist nationwide →

The 8 certified registered nurse anesthetist records with the nearest ZIP codes

  1. Alexandra OmandamFresno, CA 937221558931022
  2. Molly BurgerFresno, CA 937211972262814
  3. Isaac CesaireFresno, CA 937211710842141
  4. Jeffrey CussonFresno, CA 937211871253369
  5. Njeri GathuraFresno, CA 937211417631615
  6. Curtis Hata, CRNAFresno, CA 937211225794472
  7. Skyler Ibarra, CRNAFresno, CA 937211588547947
  8. Blake Joyce, DNP, CRNAFresno, CA 937211073478541

Common questions

What is Karen Isak, RN's NPI number?

Karen Isak, RN's National Provider Identifier (NPI) is 1174394274, issued on Jan 9, 2024. An NPI identifies a provider in billing; it is not a license.

Where is Karen Isak, RN located?

The NPPES record lists a practice address at 20 River Park PL W Fresno CA 93720, Fresno, CA, 93724. Phone: (916) 202-6761. Providers update this record themselves, so call before visiting.

How can I verify Karen Isak, RN's license?

NPPES lists California license number 157471, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity 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.