Doctor profile · Federal record
Dr. Wassim Assaf, MD
Sleep Medicine (Internal Medicine) Physician (CMS: Internal Medicine) · Internal Medicine Physician · Auburn, MA
- NPI 1548400278
- Accepts Medicare
- 22 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 4 locations .
- Primary practice
-
48 Auburn St Ste 1
Auburn, MA 015012438
(774) 772-7058
fax (774) 772-7059 - Additional location
-
119 Belmont St
Worcester, MA 016052903
(508) 334-8515
fax (508) 334-6490 - Additional location
-
157 Union St
Marlborough, MA 017521228
(508) 486-5678
fax (508) 486-5677 - Additional location
-
55 Lake Ave N
Worcester, MA 016550002
(508) 334-8515
fax (508) 334-6490 - Mailing address
-
Po Box 415348
Boston, MA 022415348
Show 1 more location
Credentials & registration
- NPI registered
- February 2009 — 17 yrs on file
- Profile last updated
- February 3, 2021
- Year of graduation
- 2004 — 22 yrs since
- Specialty taxonomy
- 207RS0012X — NUCC code
- State license (1)
- Massachusetts #265574
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1548400278. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
836
Distinct HCPCS
10
Medicare allowed
$100,750
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 271 | 112 | $80 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 132 | 70 | $120 | |
99239 |
Hospital discharge day management, more than 30 minutes | 68 | 66 | $116 | |
95811 |
Sleep study in sleep lab with continuous airway pressure (6 years or older) | 52 | 25 | $333 | |
99238 |
Hospital discharge day management, 30 minutes or less | 51 | 51 | $82 | |
95800 |
Sleep study including heart rate, breathing, and sleep time | 49 | 24 | $80 | |
95810 |
Sleep study in sleep lab (6 years or older) | 40 | 19 | $319 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 40 | 37 | $127 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 37 | 29 | $70 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 25 | 25 | $114 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 59. This provider delivers 14× the peer median.Open Payments
Industry payments received
All-time total
$56
Transactions
2
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Inspire Medical Systems, Inc. | 2 | $56.47 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
72
Patients
33
Total drug cost
$920
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Cefpodoxime Proxetil | Generic | 21 | 20 | $533 |
| Furosemide | Generic | 14 | 0 | $77 |
| Prednisone | Generic | 13 | 13 | $66 |
| Clonazepam | Generic | 12 | 0 | $155 |
| Gabapentin | Generic | 12 | 0 | $90 |
Hospital affiliations
Frequently asked questions
What is Dr. Wassim Assaf's medical specialty?
Dr. Wassim Assaf practices Sleep Medicine (Internal Medicine) Physician in Auburn, MA.
Where does Dr. Wassim Assaf practice?
Dr. Wassim Assaf practices at 48 Auburn St Ste 1, Auburn, MA 015012438. Office phone: 7747727058.
What is Dr. Wassim Assaf's NPI?
Dr. Wassim Assaf's National Provider Identifier (NPI) is 1548400278, issued by NPPES.
Does Dr. Wassim Assaf accept Medicare assignment?
Yes. Dr. Wassim Assaf accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Wassim Assaf commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.