William Greene, MD
NPI 1821188020 · Psychiatry Physician · Gainesville, FL
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Greene, MD is a Psychiatry Physician provider in Gainesville, FL (NPI 1821188020).
Provider details
- NPI number
- 1821188020
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- TRN7301 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
573 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 362 | $119 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 135 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 62 | $86 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 14 | $190 |
Typical Medicare-allowed amounts for these services range $16–$190 (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 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clonazepam | 65 | 20 |
| Trazodone Hcl | 63 | 23 |
| Quetiapine Fumarate | 60 | 13 |
| Aripiprazole | 56 | 21 |
| Duloxetine Hcl | 54 | 18 |
| Bupropion Hclbrand: Bupropion Xl | 49 | 17 |
| Buprenorphine Hcl/Naloxone Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2017-02-20
Frequently asked questions
- What is William Greene's NPI number?
- William Greene's National Provider Identifier (NPI) is 1821188020, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Greene's specialty?
- William Greene is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is William Greene located?
- William Greene's practice location on file with NPPES is 1600 Sw Archer Rd, Gainesville, FL 32610-3001.
- What is William Greene's phone number?
- The practice phone number listed in the NPPES registry for William Greene is (352) 265-0301.
- Does William Greene accept Medicare?
- William Greene is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Greene's NPI active?
- Yes — William Greene's NPI (1821188020) is active in the NPPES registry as of the last update on 2017-02-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.