Margaret M. Guo, MD
Hospitalist Physician · Santa Rosa, CA
Margaret M. Guo, MD is a hospitalist physician with a practice address in Santa Rosa, California, and NPI 1760566764, issued on Oct 25, 2006. Check the license (California A76449, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Margaret M. Guo
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A76449 CA
Self-reported in NPPES; status is on the state search - Practice location
- 401 Bicentennial Way, Santa Rosa, CA 95403
- Phone
- (707) 571-4000
- Enumerated
- Oct 25, 2006
- Record last updated
- Dec 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A764490 CA
- Medicare enrollment
- Enrolled (PECOS I20110113000354); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 401 Bicentennial Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anna Ackerman, RNRegistered Nurse1376409409
- Patricia AdamsPhysical Therapist1124971825
- Hugo Aguilar, PHARMDPharmacist1992389134
- Heather Aiello, OTR/LOccupational Therapist1851155022
- Sandra Akrawi, REGISTERED DIETITIANRegistered Dietitian1790821031
- Miguel Alcala, LCSWClinical Social Worker1629857891
Verify Margaret M. Guo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A76449Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average hospitalist physician in 2024
147 Medicare Part D claims for 65 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate13 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
- Permanente Medical Group IncSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret M. Guo among 3,099 hospitalist physician records in California
Margaret M. Guo, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated1999 · median 2010 among the 2,505 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Santa Rosa → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Pankaj Arora, MDSanta Rosa, CA 954031033110044
- B. Pamela Burleson, MDSanta Rosa, CA 954031760566830
- Frederick Challoner, MDSanta Rosa, CA 954031043394117
- Helen Hammer, MDSanta Rosa, CA 954031962586933
- Garima Hoffmann, MDSanta Rosa, CA 954031861576837
- Vivek Kumra, MDSanta Rosa, CA 954031972687044
- Deborah Lawson, MDSanta Rosa, CA 954031548332349
- Joseph Matel, M.D.Santa Rosa, CA 954031871792382
Common questions
What is Margaret M. Guo, MD's NPI number?
Margaret M. Guo, MD's National Provider Identifier (NPI) is 1760566764, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret M. Guo, MD located?
The NPPES record lists a practice address at 401 Bicentennial Way, Santa Rosa, CA, 95403. Phone: (707) 571-4000. Providers update this record themselves, so call before visiting.
How can I verify Margaret M. Guo, MD's license?
NPPES lists California license number A76449, 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 Margaret M. Guo, MD prescribe under Medicare Part D?
In 2024, Margaret M. Guo, MD had 147 Medicare Part D claims for 65 beneficiaries; the average among hospitalist physician prescribers was 521. 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.