Nathaniel A. Keller, M.D.
Psychiatry Physician · Orlando, FL
Nathaniel A. Keller, M.D. is a psychiatry physician with a practice address in Orlando, Florida, and NPI 1144411844, issued on Aug 7, 2007. Check the license (Florida ME87905, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Nathaniel A. Keller
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- ME87905 FL
Self-reported in NPPES; status is on the state search - Practice location
- 52 W Underwood St, Orlando, FL 32806
- Phone
- (407) 262-2220
- Enumerated
- Aug 7, 2007
- Record last updated
- Oct 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (407) 834-5011
- Medicaid ID
- 016613800 FL
- Medicare enrollment
- Enrolled (PECOS I20041116000311); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,744 in Florida → Look up another NPI →
Also registered at 52 W Underwood St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathaniel A. Keller in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME87905Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% more Medicare Part D claims than the average psychiatry physician in 2024
1,480 Medicare Part D claims for 128 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were under 1% of claims.
Most prescribed
- Alprazolam237 claims
- Sertraline Hcl188 claims
- Clonazepam172 claims
- Bupropion Xl114 claims
- Fluoxetine Hcl88 claims
- Duloxetine Hcl74 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
- Orlando Health Medical Group IncOrlando, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel A. Keller among 2,744 psychiatry physician records in Florida
Nathaniel A. Keller, M.D. is one of 2,744 psychiatry physician records with a practice address in Florida. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 47% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 47% of these records are
- Graduated1996 · median 2003 among the 1,283 with a school on file
- Record last updated2020 · 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 2084P0800X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Florida
There are 2,744 psychiatry physician records in Florida.
All 2,744 in Florida → Every provider in Orlando → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Marina Daher, LCSWOrlando, FL 328061891414561
- Jeanne Gifford, M.D.Orlando, FL 328061346232154
- Ernest Jermin, MDOrlando, FL 328061972769776
- Chloe Murray, DOOrlando, FL 328061871159376
- Aftab Qadir, M.D.Orlando, FL 328061972674349
- Sofia Qadir, MDOrlando, FL 328061659442515
- Laura Tait, M.D.Orlando, FL 328061043658636
- Maria Alvarado, M.D.Orlando, FL 328071881822385
Common questions
What is Nathaniel A. Keller, M.D.'s NPI number?
Nathaniel A. Keller, M.D.'s National Provider Identifier (NPI) is 1144411844, issued on Aug 7, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel A. Keller, M.D. located?
The NPPES record lists a practice address at 52 W Underwood St, Orlando, FL, 32806. Phone: (407) 262-2220. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel A. Keller, M.D.'s license?
NPPES lists Florida license number ME87905, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathaniel A. Keller, M.D. prescribe under Medicare Part D?
In 2024, Nathaniel A. Keller, M.D. had 1,480 Medicare Part D claims for 128 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.