Nathaniel Keller, M.D.
NPI 1144411844 · Psychiatry Physician · Orlando, FL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathaniel Keller, M.D. is a Psychiatry Physician provider in Orlando, FL (NPI 1144411844).
Provider details
- NPI number
- 1144411844
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- ME87905 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
737 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 227 | $92 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 170 | $77 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 153 | $63 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 127 | $167 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 60 | $167 |
Typical Medicare-allowed amounts for these services range $63–$167 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 237 | 29 |
| Sertraline Hcl | 188 | 36 |
| Clonazepam | 172 | 23 |
| Bupropion Hclbrand: Bupropion Xl | 114 | 25 |
| Fluoxetine Hcl | 88 | 12 |
| Duloxetine Hcl | 74 | 14 |
| Trazodone Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-07
- Last updated
- 2020-10-29
- Certified
- 2020-10-29
Frequently asked questions
- What is Nathaniel Keller's NPI number?
- Nathaniel Keller's National Provider Identifier (NPI) is 1144411844, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathaniel Keller's specialty?
- Nathaniel Keller is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Nathaniel Keller located?
- Nathaniel Keller's practice location on file with NPPES is 52 W Underwood St, Orlando, FL 32806-1110.
- What is Nathaniel Keller's phone number?
- The practice phone number listed in the NPPES registry for Nathaniel Keller is (407) 262-2220.
- Does Nathaniel Keller accept Medicare?
- Nathaniel Keller is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathaniel Keller's NPI active?
- Yes — Nathaniel Keller's NPI (1144411844) is active in the NPPES registry as of the last update on 2020-10-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.