Gretchen H. Rooker, MD
Internal Medicine Physician · Mountain View, CA
Gretchen H. Rooker, MD is an internal medicine physician with a practice address in Mountain View, California, and NPI 1114004066, issued on Oct 31, 2006. Check the license (California G65166, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gretchen H. Rooker
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G65166 CA
Self-reported in NPPES; status is on the state search - Practice location
- 555 Castro St, Mountain View, CA 94041
- Phone
- (650) 903-3000
- Enumerated
- Oct 31, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G651660 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
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Verify Gretchen H. Rooker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G65166Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
22 Medicare Part D claims for 22 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of claims.
Most prescribed
- Adacel Tdap22 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.
Gretchen H. Rooker among 17,696 internal medicine physician records in California
Gretchen H. Rooker, 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 fileNo · 63% of these records are
- Record last updated2007 · 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).
119 internal medicine physician records list a practice address in Mountain View
They are 119 of the 2,467 NPPES records with a practice address in Mountain View, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Mountain View → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Liteh Chang, MDMountain View, CA 940411255418190
- Arleen Chang, MDMountain View, CA 940411679650501
- Karunasree Cherukuri, MDMountain View, CA 940411831276781
- Sandy Chun, MDMountain View, CA 940411144307083
- Sonali Gotmare, MDMountain View, CA 940411346327285
- George Greenwald, MDMountain View, CA 940411952451767
- Hong Gu, MDMountain View, CA 940411205908027
- Susie Jang, MDMountain View, CA 940411871554022
Common questions
What is Gretchen H. Rooker, MD's NPI number?
Gretchen H. Rooker, MD's National Provider Identifier (NPI) is 1114004066, issued on Oct 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gretchen H. Rooker, MD located?
The NPPES record lists a practice address at 555 Castro St, Mountain View, CA, 94041. Phone: (650) 903-3000. Providers update this record themselves, so call before visiting.
How can I verify Gretchen H. Rooker, MD's license?
NPPES lists California license number G65166, 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 Gretchen H. Rooker, MD prescribe under Medicare Part D?
In 2024, Gretchen H. Rooker, MD had 22 Medicare Part D claims for 22 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.