Irene Shih, MD
Internal Medicine Physician · Palo Alto, CA
Irene Shih, MD is an internal medicine physician with a practice address in Palo Alto, California, and NPI 1982773966, issued on Nov 6, 2006. Check the license (California A54608, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Irene Shih
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A54608 CA
Self-reported in NPPES; status is on the state search - Practice location
- 211 Quarry RD, Palo Alto, CA 94304
- Phone
- (650) 325-6778
- Enumerated
- Nov 6, 2006
- Record last updated
- Mar 27, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (650) 325-1816
- Medicare enrollment
- Enrolled (PECOS I20050927001550); may accept Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1994
- 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 211 Quarry RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Riti Gupta, PHARMD, BCPSAmbulatory Care Pharmacist1760032189
- Matthew Hall, LCGCGenetic Counselor (M.S.)1609267582
- Rita Hamad, M.D.Family Medicine Physician1255614442
Verify Irene Shih in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A54608Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,341 Medicare Part D claims for 127 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium96 claims
- Amlodipine Besylate88 claims
- Lisinopril63 claims
- Atorvastatin Calcium60 claims
- Lorazepam39 claims
- Zolpidem Tartrate37 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.
Irene Shih among 17,696 internal medicine physician records in California
Irene Shih, 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
- Graduated1994 · median 2004 among the 11,065 with a school on file
- Record last updated2013 · 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).
187 internal medicine physician records list a practice address in Palo Alto
They are 187 of the 7,617 NPPES records with a practice address in Palo Alto, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Palo Alto → Internal Medicine Physician nationwide →
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- Stephen Ezeji-Okoye, M.D.Palo Alto, CA 943041366493595
- Susan Frayne, MD, MPHPalo Alto, CA 943041952314890
- James Hallenbeck, MDPalo Alto, CA 943041316982358
- Rhonda Hamilton, M.D.Palo Alto, CA 943041225063241
Common questions
What is Irene Shih, MD's NPI number?
Irene Shih, MD's National Provider Identifier (NPI) is 1982773966, issued on Nov 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Irene Shih, MD located?
The NPPES record lists a practice address at 211 Quarry RD, Palo Alto, CA, 94304. Phone: (650) 325-6778. Providers update this record themselves, so call before visiting.
How can I verify Irene Shih, MD's license?
NPPES lists California license number A54608, 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 Irene Shih, MD prescribe under Medicare Part D?
In 2024, Irene Shih, MD had 1,341 Medicare Part D claims for 127 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.