Quick answers
- Does Thomas G. Willett accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas G. Willett accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Thomas G. Willett see?
- In 2024, CMS data shows 105 Original Medicare patients and 1,490 services for Thomas G. Willett. This counts Original Medicare only and measures volume, not quality.
- What is Thomas G. Willett's NPI number?
- 1740229483. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Thomas G. Willett, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 105 |
|---|---|
| Services billed to Medicare | 1,490 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Psychotherapy with evaluation and management visit, 30 minutes (90833)688 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)456 services
- Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional (99211)211 services
- Psychotherapy, 45 minutes (90834)85 services
- Psychiatric diagnostic evaluation with medical services (90792)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure70%
- High cholesterol69%
- Arthritis51%
- Depression51%
- Anxiety51%
- Diabetes31%
Practice locations
Addresses where Thomas G. Willett is enrolled with Medicare (CMS data updated October 2, 2026).
- 4477 W 118th St, Suite 400Hawthorne, CA 90250 (210) 978‑0884
Specialties
- Psychiatryprimary
Other psychiatrists in Hawthorne
Clinicians with the same Medicare primary specialty in Hawthorne, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1967 (59 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740229483 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians