Shaun Michael Pienkos, MD
Critical Care Medicine (Internal Medicine) Physician · Stanford, CA
Shaun Michael Pienkos, MD is a critical care medicine (internal medicine) physician with a practice address in Stanford, California, and NPI 1245735208, issued on Mar 29, 2018. Check the license (California A165909, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Shaun Michael Pienkos
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- A165909 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 725-7061
- Enumerated
- Mar 29, 2018
- Record last updated
- Jul 29, 2024
- Fax
- (650) 498-6205
- Medicare enrollment
- Enrolled (PECOS I20240617001631); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 723 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Shaun Michael Pienkos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A165909Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
80 Medicare Part D claims for 17 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of 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.
2 hospitals and group practices
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
- University Healthcare AllianceSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Shaun Michael Pienkos among 723 critical care medicine (internal medicine) physician records in California
Shaun Michael Pienkos, MD is one of 723 critical care medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 91% of them.
- NPI issued2018 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2018 · median 2005 among the 559 with a school on file
- Record last updated2024 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
All 723 in California → Every provider in Stanford → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Nikhil Barot, M.D.Stanford, CA 943051518155928
- Harmeet Bedi, MDStanford, CA 943051548402084
- Carlos Brun, M.D.Stanford, CA 943051578752309
- Michelle Cao, DOStanford, CA 943051386791762
- Pedram Fatehi, MD, MPHStanford, CA 943051790927895
- Shawn Kaku, MDStanford, CA 943051093977696
- Joseph Levitt, MDStanford, CA 943051033251152
- Tsuyoshi Mitarai, MDStanford, CA 943051083758197
Common questions
What is Shaun Michael Pienkos, MD's NPI number?
Shaun Michael Pienkos, MD's National Provider Identifier (NPI) is 1245735208, issued on Mar 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Shaun Michael Pienkos, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 725-7061. Providers update this record themselves, so call before visiting.
How can I verify Shaun Michael Pienkos, MD's license?
NPPES lists California license number A165909, 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 Shaun Michael Pienkos, MD prescribe under Medicare Part D?
In 2024, Shaun Michael Pienkos, MD had 80 Medicare Part D claims for 17 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.