Doctor profile · Federal record
Dr. Mark Nitzberg, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Methuen, MA
- NPI 1881652758
- Accepts Medicare
- 37 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
38R Merrimack St., Suite 2C
Methuen, MA 01844
(978) 681-1977
fax (978) 686-8918 - Mailing address
-
380R Merrimack St., Suite 2C
Methuen, MA 01844
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- November 16, 2017
- Year of graduation
- 1989 — 37 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Massachusetts #74584
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1881652758. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
333
Distinct HCPCS
10
Medicare allowed
$48,108
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99203 |
New patient office or other outpatient visit, 30-44 minutes | 61 | 61 | $110 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 61 | 54 | $91 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 42 | 42 | $200 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 38 | 38 | $103 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 30 | 30 | $243 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 28 | 28 | $196 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 21 | 20 | $179 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 20 | 20 | $111 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 20 | 20 | $132 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 12 | 12 | $182 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 33. This provider delivers 10× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
662
Patients
164
Total drug cost
$10,611
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 240 | 79 | $3,945 |
| Atorvastatin Calcium | Generic | 60 | 19 | $1,673 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 54 | 53 | $766 |
| Pantoprazole Sodium | Generic | 44 | 13 | $1,033 |
| Losartan Potassium | Generic | 42 | 0 | $520 |
| Famotidine | Generic | 27 | 0 | $518 |
| Alendronate Sodium | Generic | 26 | 0 | $199 |
| Hydrochlorothiazide | Generic | 23 | 0 | $173 |
| Lisinopril | Generic | 23 | 0 | $112 |
| Triamterene-Hydrochlorothiazid (Triamterene/Hydrochlorothiazid) | Brand | 23 | 0 | $400 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Nitzberg's medical specialty?
Dr. Mark Nitzberg practices Gastroenterology Physician in Methuen, MA.
Where does Dr. Mark Nitzberg practice?
Dr. Mark Nitzberg practices at 38R Merrimack St., Methuen, MA 01844. Office phone: 9786811977.
What is Dr. Mark Nitzberg's NPI?
Dr. Mark Nitzberg's National Provider Identifier (NPI) is 1881652758, issued by NPPES.
Does Dr. Mark Nitzberg accept Medicare assignment?
Yes. Dr. Mark Nitzberg accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Nitzberg commonly perform?
Top Medicare-reported procedures in 2023: New patient office or other outpatient visit (HCPCS 99203); Established patient office or other outpatient visit (HCPCS 99213); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.