Doctor profile · Federal record
Dr. Norman Nishioka, MD
Gastroenterology Physician (CMS: Gastroenterology) · Internal Medicine Physician · Boston, MA
- NPI 1174513600
- Accepts Medicare
- 45 yrs in practice
- Male
- No sanctions
Practice & contact
- Primary practice
-
55 Fruit St, Gastroenterology Associates Blk 4
Boston, MA 021142621
(617) 726-4422
fax (617) 724-6832 - Mailing address
-
Po Box 9142, Mass General Physician Organization
Charlestown, MA 021299142
Credentials & registration
- NPI registered
- October 2005 — 21 yrs on file
- Profile last updated
- September 11, 2025
- Year of graduation
- 1981 — 45 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Massachusetts #51195
- Medicaid
- MA #3024822
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1174513600. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,779
Distinct HCPCS
10
Medicare allowed
$206,767
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
G0500 |
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | 580 | 574 | $6 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 446 | 445 | $268 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 196 | 196 | $38 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 195 | 193 | $115 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 89 | 73 | $104 | |
43270 |
Destruction of polyp or growth of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 66 | 43 | $230 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 53 | 53 | $195 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 40 | 40 | $153 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 26 | 18 | $53 | |
99443 |
Telephone medical discussion with physician, 21-30 minutes | 22 | 18 | $103 |
In context: peer comparison
Among 78 peers in Boston Gastroenterology Physician, average services per provider: 56. This provider delivers 32× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
542
Patients
412
Total drug cost
$15,553
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 313 | 310 | $4,709 |
| Omeprazole | Generic | 147 | 53 | $7,665 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 20 | 20 | $432 |
| Pantoprazole Sodium | Generic | 18 | 0 | $875 |
| Peg-3350 and Electrolytes (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 17 | 17 | $289 |
| Esomeprazole Magnesium | Generic | 15 | 0 | $712 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 12 | 12 | $870 |
Frequently asked questions
What is Dr. Norman Nishioka's medical specialty?
Dr. Norman Nishioka practices Gastroenterology Physician in Boston, MA.
Where does Dr. Norman Nishioka practice?
Dr. Norman Nishioka practices at 55 Fruit St, Boston, MA 021142621. Office phone: 6177264422.
What is Dr. Norman Nishioka's NPI?
Dr. Norman Nishioka's National Provider Identifier (NPI) is 1174513600, issued by NPPES.
Does Dr. Norman Nishioka accept Medicare assignment?
Yes. Dr. Norman Nishioka accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Norman Nishioka commonly perform?
Top Medicare-reported procedures in 2023: Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (HCPCS G0500); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.