Alexander Adu Clerk, M.D.
Sleep Specialist (PhD) · San Jose, CA
Alexander Adu Clerk, M.D. is a sleep specialist (phd) with a practice address in San Jose, California, and NPI 1902911381, issued on Aug 19, 2006. Check the license (California 448, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Alexander Adu Clerk
- Credential
- M.D.
- Primary taxonomy
- Sleep Specialist (PhD) 173F00000X
- License numbers
- 448 CA
A36573 CA
Self-reported in NPPES; status is on the state search - Practice location
- 455 Oconnor Dr Ste 110, San Jose, CA 95128
- Phone
- (408) 295-4532
- Enumerated
- Aug 19, 2006
- Record last updated
- Jan 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (408) 295-4738
- Medicare enrollment
- Enrolled (PECOS I20120319000602); may accept Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1975
- Entity
- Type 1 · individual
4 nearest sleep specialist (phd) records → All 5 in California → Look up another NPI →
Verify Alexander Adu Clerk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 448Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average sleep specialist (phd) in 2024
61 Medicare Part D claims for 15 beneficiaries, against an average of 934 among the 5 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Trazodone Hcl19 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.
Sleep Specialist (PhD) providers in California
There are 5 sleep specialist (phd) records in California.
All 5 in California → Every provider in San Jose → Sleep Specialist (PhD) nationwide →
The 4 sleep specialist (phd) records with the nearest ZIP codes
- David Woods, PH.D.Martinez, CA 945531467885566
- Elias MohammedSacramento, CA 958151043052749
- Tara NaderSouth San Francisco, CA 940801619306693
- Cheryl SpinweberLa Jolla, CA 920371487772794
Common questions
What is Alexander Adu Clerk, M.D.'s NPI number?
Alexander Adu Clerk, M.D.'s National Provider Identifier (NPI) is 1902911381, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Adu Clerk, M.D. located?
The NPPES record lists a practice address at 455 Oconnor Dr Ste 110, San Jose, CA, 95128. Phone: (408) 295-4532. Providers update this record themselves, so call before visiting.
How can I verify Alexander Adu Clerk, M.D.'s license?
NPPES lists California license number 448, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Alexander Adu Clerk, M.D. prescribe under Medicare Part D?
In 2024, Alexander Adu Clerk, M.D. had 61 Medicare Part D claims for 15 beneficiaries; the average among sleep specialist (phd) prescribers was 934. 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.