Christopher Calkins, MD
Internal Medicine Physician · Stanford, CA
Christopher Calkins, MD is an internal medicine physician with a practice address in Stanford, California, and NPI 1144809666, issued on Apr 2, 2021. Check the license (California A195245, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christopher Calkins
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A195245 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr RM G306, Stanford, CA 94305
- Phone
- (650) 723-5948
- Enumerated
- Apr 2, 2021
- Record last updated
- May 5, 2024
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 300 Pasteur Dr RM G306
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Rose, MDInternal Medicine Physician1982280442
Verify Christopher Calkins in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A195245Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
67 Medicare Part D claims for 31 beneficiaries, against an average of 3,176 among the 108,855 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.
Christopher Calkins among 17,696 internal medicine physician records in California
Christopher Calkins, 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 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2024 · 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).
378 internal medicine physician records list a practice address in Stanford
They are 378 of the 5,606 NPPES records with a practice address in Stanford, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Stanford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michele Barry, MDStanford, CA 943051407839632
- Jennifer Bollyky, M.D.Stanford, CA 943051497717748
- Nancy Cuan, MDStanford, CA 943051891764791
- Korina De Bruyne, MDStanford, CA 943051770545824
- Madhav Goyal, MDStanford, CA 943051386697878
- Theresa Greco, MDStanford, CA 943051356318240
- Maria Juarez-Reyes, MD, PHDStanford, CA 943051790749877
- Lawrence Kwan, MDStanford, CA 943051922062835
Common questions
What is Christopher Calkins, MD's NPI number?
Christopher Calkins, MD's National Provider Identifier (NPI) is 1144809666, issued on Apr 2, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Christopher Calkins, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr RM G306, Stanford, CA, 94305. Phone: (650) 723-5948. Providers update this record themselves, so call before visiting.
How can I verify Christopher Calkins, MD's license?
NPPES lists California license number A195245, 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 Christopher Calkins, MD prescribe under Medicare Part D?
In 2024, Christopher Calkins, MD had 67 Medicare Part D claims for 31 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.