James S. Kastelman, MD
Internal Medicine Physician · Campbell, CA
James S. Kastelman, MD is an internal medicine physician with a practice address in Campbell, California, and NPI 1730266677, issued on Oct 31, 2006. Check the license (California G54963, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James S. Kastelman
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G54963 CA
Self-reported in NPPES; status is on the state search - Practice location
- 220 E Hacienda Ave, Campbell, CA 95008
- Phone
- (408) 236-6400
- Enumerated
- Oct 31, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G549630 CA
- Medicare enrollment
- Enrolled (PECOS I20110506000713); accepts Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 220 E Hacienda Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James S. Kastelman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G54963Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
108 Medicare Part D claims for 70 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Ciprofloxacin Hcl13 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.
James S. Kastelman among 17,696 internal medicine physician records in California
James S. Kastelman, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1983 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 internal medicine physician records list a practice address in Campbell
They are 25 of the 1,821 NPPES records with a practice address in Campbell, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Campbell → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sameer Awsare, MDCampbell, CA 950081598842437
- Sailaja Bommakanti, M.D.Campbell, CA 950081194828285
- Lily Boris, M.D.Campbell, CA 950081801988977
- Debra Fetters, MDCampbell, CA 950081689751547
- Andrew Hwang, MDCampbell, CA 950081679650535
- Aradhana Kar, MDCampbell, CA 950081447358692
- Rupinder Kaur, MDCampbell, CA 950081386721231
- Lily Lee, MDCampbell, CA 950081518044460
Common questions
What is James S. Kastelman, MD's NPI number?
James S. Kastelman, MD's National Provider Identifier (NPI) is 1730266677, issued on Oct 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James S. Kastelman, MD located?
The NPPES record lists a practice address at 220 E Hacienda Ave, Campbell, CA, 95008. Phone: (408) 236-6400. Providers update this record themselves, so call before visiting.
How can I verify James S. Kastelman, MD's license?
NPPES lists California license number G54963, 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 James S. Kastelman, MD prescribe under Medicare Part D?
In 2024, James S. Kastelman, MD had 108 Medicare Part D claims for 70 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.