Matthew Sinclair Stubblefield, M.D.
Psychiatry Physician · Palo Alto, CA
Matthew Sinclair Stubblefield, M.D. is a psychiatry physician with a practice address in Palo Alto, California, and NPI 1326215740, issued on May 14, 2008. Check the license (California G072442, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew Sinclair Stubblefield
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G072442 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3303 Alma St, Palo Alto, CA 94306
- Phone
- (650) 856-0406
- Enumerated
- May 14, 2008
- Record last updated
- May 14, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (650) 856-0140
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Verify Matthew Sinclair Stubblefield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G072442Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average psychiatry physician in 2024
172 Medicare Part D claims for 12 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Dextroamphetamine-Amphet Er29 claims
- Atomoxetine Hcl20 claims
- Dextroamphetamine-Amphetamine14 claims
- Escitalopram Oxalate12 claims
- Dextroamphetamine Sulfate Er11 claims
- Methylphenidate Er11 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.
Matthew Sinclair Stubblefield among 8,673 psychiatry physician records in California
Matthew Sinclair Stubblefield, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 52% of them.
- NPI issued2008 · 52% of these records are older, 43% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2008 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
215 psychiatry physician records list a practice address in Palo Alto
They are 215 of the 7,617 NPPES records with a practice address in Palo Alto, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Palo Alto → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Denis Clegg, M.D.Palo Alto, CA 943061235151606
- John GlathePalo Alto, CA 943061265889133
- Sanjay JasujaPalo Alto, CA 943061992097117
- Hayyah Muller, MDPalo Alto, CA 943061780783480
- Mala Nayak, MDPalo Alto, CA 943061215036918
- William Sastry, M.D.Palo Alto, CA 943061699845859
- Janet Spraggins, MDPalo Alto, CA 943061457438392
- Kathryn StephensPalo Alto, CA 943061720646490
Common questions
What is Matthew Sinclair Stubblefield, M.D.'s NPI number?
Matthew Sinclair Stubblefield, M.D.'s National Provider Identifier (NPI) is 1326215740, issued on May 14, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Sinclair Stubblefield, M.D. located?
The NPPES record lists a practice address at 3303 Alma St, Palo Alto, CA, 94306. Phone: (650) 856-0406. Providers update this record themselves, so call before visiting.
How can I verify Matthew Sinclair Stubblefield, M.D.'s license?
NPPES lists California license number G072442, 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 Matthew Sinclair Stubblefield, M.D. prescribe under Medicare Part D?
In 2024, Matthew Sinclair Stubblefield, M.D. had 172 Medicare Part D claims for 12 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.