William Drexel, D.O.
NPI 1639431729 · Psychiatry Physician · Valhalla, NY
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Drexel, D.O. is a Psychiatry Physician provider in Valhalla, NY (NPI 1639431729).
Provider details
- NPI number
- 1639431729
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2172971 (RI)
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
14 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
580 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) |
|---|---|---|
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 412 | $46 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 121 | $74 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 32 | $108 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 15 | $76 |
Typical Medicare-allowed amounts for these services range $46–$108 (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 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Olanzapine | 35 | 23 |
| Quetiapine Fumarate | 31 | 22 |
| Risperidone | 23 | 17 |
| Ibuprofen | 22 | 22 |
| Benztropine Mesylate | 20 | 17 |
| Clonidine Hcl | 20 | 18 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 17 | 17 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-06-13
- Last updated
- 2013-03-08
Frequently asked questions
- What is William Drexel's NPI number?
- William Drexel's National Provider Identifier (NPI) is 1639431729, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Drexel's specialty?
- William Drexel is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Drexel located?
- William Drexel's practice location on file with NPPES is 100 Woods Rd, Valhalla, NY 10595-1530.
- What is William Drexel's phone number?
- The practice phone number listed in the NPPES registry for William Drexel is (914) 493-1939.
- Does William Drexel accept Medicare?
- William Drexel is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Drexel's NPI active?
- Yes — William Drexel's NPI (1639431729) is active in the NPPES registry as of the last update on 2013-03-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.