DR. STEPHEN C ALLISON (M.D.) – Psychiatry Physician, NPI 1023336294
Psychiatry Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,134 PSYCHIATRY in CA
Provider Addresses for DR. STEPHEN C ALLISON (M.D.)
250 BON AIR RD UNIT A
GREENBRAE, CA 949041702
Phone: (415) 925-8808
Type: Mailing
3020 BRIDGEWAY # 236
SAUSALITO, CA 949651439
Phone:
Type: Mailing
250 BON AIR RD
GREENBRAE, CA 949041702
Phone: (415) 925-7663
Fax: (415) 925-7665
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2014-06-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20140623002268 | I | Psychiatry | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 338 | 68 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 44 | 42 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 35 | 32 | $0 |
Insurance plans in this area (ZIP 94904)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PSYCHIATRY | CA | 90833 | Psychotherapy, 30 minutes with patient and/or family member | 76 | 26 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| General Surgery | CA | |
| Cardiac Electrophysiology, Internal Medicine, Nuclear Medicine, Cardiovascular Disease (Cardiology) | CA | |
| Surgical Oncology | CA | |
| Orthopedic Surgery | CA | |
| Orthopedic Surgery, Sports Medicine | CA | |
| - | CA | |
| - | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | CA | |
| - | CA | |
| - | CA |
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