DR. MARK CLAY WILLIAMS (PHD) – Clinical Psychologist, NPI 1619998416
Clinical Psychologist
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Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for DR. MARK CLAY WILLIAMS (PHD)
989, Orienta Avenue, Altamonte Springs, Seminole County, Florida, 32701, United States
LIFE CARE CENTER OF ALTAMONTE
ALTAMONTE SPRINGS, FL 32701
Phone: (407) 831-3446
Type: Location
3851, Ethan Lane, Baldwin Park, Orlando, Orange County, Florida, 32814, United States
ORLANDO, FL 328146567
Phone: (407) 647-8437
Fax: (407) 647-8437
Type: Mailing
NPPES updates history
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Medicare Enrollment & Revalidation
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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 |
|---|---|---|---|---|
| 90791 | Psychiatric diagnostic evaluation | 79 | 79 | $0 |
| 90832 | Psychotherapy, 30 minutes | 47 | 38 | $0 |
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