James P. Derum, PA-C
Physician Assistant · Walnut Creek, CA
James P. Derum, PA-C is a physician assistant with a practice address in Walnut Creek, California, and NPI 1447355474, issued on Sep 14, 2006. Check the license (California PA16110, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- James P. Derum
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA16110 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1990 N California Blvd Ste 400, Walnut Creek, CA 94596
- Phone
- (925) 225-5837
- Enumerated
- Sep 14, 2006
- Record last updated
- Apr 23, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (925) 225-5838
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 1990 N California Blvd Ste 400
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James P. Derum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA16110Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average physician assistant in 2024
42 Medicare Part D claims, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
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.
James P. Derum among 14,451 physician assistant records in California
James P. Derum, 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 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2013 · 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
- 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
- Katherine Mader, PA-CWalnut Creek, CA 945961730416066
Common questions
What is James P. Derum, PA-C's NPI number?
James P. Derum, PA-C's National Provider Identifier (NPI) is 1447355474, issued on Sep 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James P. Derum, PA-C located?
The NPPES record lists a practice address at 1990 N California Blvd Ste 400, Walnut Creek, CA, 94596. Phone: (925) 225-5837. Providers update this record themselves, so call before visiting.
How can I verify James P. Derum, PA-C's license?
NPPES lists California license number PA16110, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does James P. Derum, PA-C prescribe under Medicare Part D?
In 2024, James P. Derum, PA-C had 42 Medicare Part D claims; 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.