Doctor profile · Federal record
Dr. Mark Williams, PHD
Clinical Psychologist · Altamonte Springs, FL
- NPI 1619998416
- MIPS 100.0 / 100 · 2023
- 20 yrs on file
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
989 Orienta Ave, Life Care Center of Altamonte
Altamonte Springs, FL 32701
(407) 831-3446 - Mailing address
-
3851 Ethan Lane
Orlando, FL 328146567
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Specialty taxonomy
- 103TC0700X — NUCC code
- State license (1)
- Florida #PY0003957
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1619998416. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
126
Distinct HCPCS
2
Medicare allowed
$14,586
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
90791 |
Psychiatric diagnostic evaluation | 79 | 79 | $146 | |
90832 |
Psychotherapy, 30 minutes | 47 | 38 | $64 |
In context: peer comparison
Among 1 peers in Altamonte Springs Clinical Psychologist, average services per provider: 63. This provider delivers 2.0× the peer median.Frequently asked questions
What is Dr. Mark Williams's medical specialty?
Dr. Mark Williams practices Clinical Psychologist in Altamonte Springs, FL.
Where does Dr. Mark Williams practice?
Dr. Mark Williams practices at 989 Orienta Ave, Altamonte Springs, FL 32701. Office phone: 4078313446.
What is Dr. Mark Williams's NPI?
Dr. Mark Williams's National Provider Identifier (NPI) is 1619998416, issued by NPPES.
What procedures does Dr. Mark Williams commonly perform?
Top Medicare-reported procedures in 2023: Psychiatric diagnostic evaluation (HCPCS 90791); Psychotherapy (HCPCS 90832). Source: CMS Medicare Physician & Other Practitioners file.