Grace Guo, MD
Internal Medicine Physician · Sunnyvale, CA
Grace Guo, MD is an internal medicine physician with a practice address in Sunnyvale, California, and NPI 1902811375, issued on Jul 31, 2006. Check the license (California A64096, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Grace Guo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A64096 CA
Self-reported in NPPES; status is on the state search - Practice location
- 401 Old San Francisco RD, Sunnyvale, CA 94086
- Phone
- (408) 730-4360
- Enumerated
- Jul 31, 2006
- Record last updated
- Dec 1, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080714000636); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1996
- 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 401 Old San Francisco RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Leone Baron, PT, DPTPhysical Therapist1538708839
- Priya Bhusri, M.D.Internal Medicine Physician1659386019
- Yeralis Cabrero, PT, DPTPhysical Therapist1639991714
- Rafael Cahill, DPTPhysical Therapist1235742057
- Natalie Chan, DPTPhysical Therapist1619730629
Verify Grace Guo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64096Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,478 Medicare Part D claims for 159 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium235 claims
- Amlodipine Besylate156 claims
- Alendronate Sodium82 claims
- Losartan Potassium72 claims
- Levothyroxine Sodium67 claims
- Lisinopril62 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationLos Altos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grace Guo among 17,696 internal medicine physician records in California
Grace Guo, 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
- Graduated1996 · median 2004 among the 11,065 with a school on file
- Record last updated2011 · 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).
48 internal medicine physician records list a practice address in Sunnyvale
They are 48 of the 1,690 NPPES records with a practice address in Sunnyvale, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sunnyvale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Priya Bhusri, M.D.Sunnyvale, CA 940861659386019
- Teresa Cheng, MDSunnyvale, CA 940861598772857
- Leon Cheng, MDSunnyvale, CA 940861104834407
- Peter Fay, MDSunnyvale, CA 940861154384337
- Anitha Gundupalli, MDSunnyvale, CA 940861568571206
- Jason Hwang, M.D.Sunnyvale, CA 940861669490926
- Quanjing Liu, MDSunnyvale, CA 940861760588834
- Robina Moen, M.D.Sunnyvale, CA 940861083720346
Common questions
What is Grace Guo, MD's NPI number?
Grace Guo, MD's National Provider Identifier (NPI) is 1902811375, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Grace Guo, MD located?
The NPPES record lists a practice address at 401 Old San Francisco RD, Sunnyvale, CA, 94086. Phone: (408) 730-4360. Providers update this record themselves, so call before visiting.
How can I verify Grace Guo, MD's license?
NPPES lists California license number A64096, 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 Grace Guo, MD prescribe under Medicare Part D?
In 2024, Grace Guo, MD had 1,478 Medicare Part D claims for 159 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.