Irina Spivak, PA-C
Physician Assistant · Walnut Creek, CA
Irina Spivak, PA-C is a physician assistant with a practice address in Walnut Creek, California, and NPI 1831417252, issued on May 10, 2010. Check the license (California PA18788, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Irina Spivak
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA18788 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-7991
- Enumerated
- May 10, 2010
- Record last updated
- Jan 3, 2022
- Medicare enrollment
- Enrolled (PECOS I20111219000937); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Irina Spivak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA18788Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average physician assistant in 2024
232 Medicare Part D claims for 45 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 77% of claims.
Most prescribed
- Ajovy Autoinjector97 claims
- Ubrelvy38 claims
- Qulipta23 claims
- Nurtec Odt21 claims
- Sumatriptan Succinate13 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
- Permanente Medical Group IncRichmond, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Irina Spivak among 14,451 physician assistant records in California
Irina Spivak, PA-C is one of 14,451 physician assistant 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 2010, is newer than 27% of them.
- NPI issued2010 · 27% of these records are older, 70% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1997 · median 2018 among the 7,214 with a school on file
- Record last updated2022 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
89 physician assistant records list a practice address in Walnut Creek
They are 89 of the 6,170 NPPES records with a practice address in Walnut Creek, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Walnut Creek → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Viktor Buzin, MPA, PA-CWalnut Creek, CA 945961790023620
- Linda Cortez, PA-CWalnut Creek, CA 945961487927414
- James Derum, PA-CWalnut Creek, CA 945961447355474
- Zacharia Greenlee, PA-CWalnut Creek, CA 945961427469097
- Karen Hauser, PAWalnut Creek, CA 945961609085760
- Richard King, PA-CWalnut Creek, CA 945961093870016
- Kevin King, PA-CWalnut Creek, CA 945961841509171
- Cyril Kulka, PA-CWalnut Creek, CA 945961225166556
Common questions
What is Irina Spivak, PA-C's NPI number?
Irina Spivak, PA-C's National Provider Identifier (NPI) is 1831417252, issued on May 10, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Irina Spivak, PA-C located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-7991. Providers update this record themselves, so call before visiting.
How can I verify Irina Spivak, PA-C's license?
NPPES lists California license number PA18788, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Irina Spivak, PA-C prescribe under Medicare Part D?
In 2024, Irina Spivak, PA-C had 232 Medicare Part D claims for 45 beneficiaries; the average among physician assistant prescribers was 830. 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.
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.