Doctor profile · Federal record
Dr. Gad Marshall, MD
Neurology Physician (CMS: Neurology) · Boston, MA
- NPI 1639105513
- Accepts Medicare
- 26 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
Bwh Memory Disorder Unit, 221 Longwood Ave
Boston, MA 02115
(617) 732-8085
fax (617) 738-9122
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 2000 — 26 yrs since
- Specialty taxonomy
- 2084N0400X — NUCC code
- State license (1)
- California #A85728
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1639105513. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
185
Distinct HCPCS
4
Medicare allowed
$18,983
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
G2212 |
Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | 77 | 17 | $33 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 72 | 46 | $153 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 19 | 19 | $193 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 17 | 15 | $104 |
In context: peer comparison
Among 134 peers in Boston Neurology Physician, average services per provider: 234. This provider delivers 0.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
238
Patients
43
Total drug cost
$5,045
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Donepezil Hcl | Generic | 82 | 20 | $1,379 |
| Trazodone Hcl | Generic | 44 | 12 | $1,074 |
| Escitalopram Oxalate | Generic | 40 | 11 | $524 |
| Risperidone | Generic | 29 | 0 | $271 |
| Memantine Hcl | Generic | 15 | 0 | $644 |
| Methylphenidate Hcl | Generic | 14 | 0 | $804 |
| Sertraline Hcl | Generic | 14 | 0 | $347 |
Hospital affiliations
Frequently asked questions
What is Dr. Gad Marshall's medical specialty?
Dr. Gad Marshall practices Neurology Physician in Boston, MA.
Where does Dr. Gad Marshall practice?
Dr. Gad Marshall practices at Bwh Memory Disorder Unit, Boston, MA 02115. Office phone: 6177328085.
What is Dr. Gad Marshall's NPI?
Dr. Gad Marshall's National Provider Identifier (NPI) is 1639105513, issued by NPPES.
Does Dr. Gad Marshall accept Medicare assignment?
Yes. Dr. Gad Marshall accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gad Marshall commonly perform?
Top Medicare-reported procedures in 2023: Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or (HCPCS G2212); Established patient office or other outpatient visit (HCPCS 99215); New patient office or other outpatient visit (HCPCS 99205). Source: CMS Medicare Physician & Other Practitioners file.