Alexander S. Isaac, M.D.
Psychiatry Physician · Washington, DC
Alexander S. Isaac, M.D. is a psychiatry physician with a practice address in Washington, District of Columbia, and NPI 1861428054, issued on Jun 23, 2006. Check the license on the District of Columbia Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Alexander S. Isaac
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 0101234806 VA
Self-reported in NPPES; status is on the state search - Practice location
- 209 Pennsylvania Ave SE, Washington, DC 20003
- Phone
- (703) 698-0716
- Enumerated
- Jun 23, 2006
- Record last updated
- Mar 7, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 474 in District of Columbia → Look up another NPI →
Also registered at 209 Pennsylvania Ave SE
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Johanna Kaplan, PH.D.Clinical Child & Adolescent Psychologist1093149031
Verify Alexander S. Isaac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersDistrict of Columbia Board of MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average psychiatry physician in 2024
78 Medicare Part D claims for 13 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Alexander S. Isaac among 474 psychiatry physician records in District of Columbia
Alexander S. Isaac, M.D. is one of 474 psychiatry physician records with a practice address in District of Columbia. 58% 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, 75% newer
- In a Medicare fileYes · 58% of these records are
- In the CMS Doctors and Clinicians fileNo · 26% of these records are
- Record last updated2013 · 62% 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 District of Columbia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
467 psychiatry physician records list a practice address in Washington
They are 467 of the 45,857 NPPES records with a practice address in Washington, and 474 psychiatry physician records in District of Columbia.
All 474 in District of Columbia → Every provider in Washington → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Rhonda Allen, M.D.Washington, DC 200031861599490
- Joel Cohen, M.D.Washington, DC 200031093851149
- Katie DuhamelWashington, DC 200031710619572
- Safaa Kasem, M.DWashington, DC 200031023267606
- Ronald Koshes, MDWashington, DC 200031437146305
- Joelle Luke FrancisWashington, DC 200031972460632
- Angiolina Melchiorre, M.D.Washington, DC 200031821073776
- Calya Myint, MDWashington, DC 200031073649422
Common questions
What is Alexander S. Isaac, M.D.'s NPI number?
Alexander S. Isaac, M.D.'s National Provider Identifier (NPI) is 1861428054, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alexander S. Isaac, M.D. located?
The NPPES record lists a practice address at 209 Pennsylvania Ave SE, Washington, DC, 20003. Phone: (703) 698-0716. Providers update this record themselves, so call before visiting.
How can I verify Alexander S. Isaac, M.D.'s license?
Search the District of Columbia Board of Medicine at https://dchealth.dc.gov/bomed. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexander S. Isaac, M.D. prescribe under Medicare Part D?
In 2024, Alexander S. Isaac, M.D. had 78 Medicare Part D claims for 13 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.