Doctor profile · Federal record
Dr. Douglas Grunwald, MD
Gastroenterology Physician (CMS: Gastroenterology) · Hamden, CT
- NPI 1154616001
- Accepts Medicare
- MIPS 82.4 / 100 · 2023
- 15 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2200 Whitney Ave Ste 360
Hamden, CT 065183602
(203) 281-4463
fax (203) 287-2930
Credentials & registration
- NPI registered
- June 2011 — 15 yrs on file
- Profile last updated
- July 21, 2022
- Year of graduation
- 2011 — 15 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Connecticut #56120
- Medicaid
- CT #1154616001
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1154616001. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
413
Distinct HCPCS
10
Medicare allowed
$52,509
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 97 | 77 | $96 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 57 | 57 | $259 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 54 | 46 | $134 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 38 | 38 | $94 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 34 | 34 | $175 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 30 | 30 | $120 | |
99202 |
New patient office or other outpatient visit, 15-29 minutes | 26 | 26 | $75 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 25 | 25 | $136 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 23 | 23 | $84 | |
J7050 |
Infusion, normal saline solution, 250 cc | 15 | 11 | $1 |
In context: peer comparison
Among 10 peers in Hamden Gastroenterology Physician, average services per provider: 124. This provider delivers 3.3× the peer median.Open Payments
Industry payments received
All-time total
$1,192
Transactions
56
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 21 | $331.06 | |
| Qol Medical, LLC | 4 | $149.73 | |
| Celgene Corporation | 3 | $89.29 | |
| Ardelyx, INC. | 4 | $88.51 | |
| Takeda Pharmaceuticals U.S.A., INC. | 4 | $73.80 | |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | 3 | $62.24 | |
| Pfizer INC. | 4 | $60.58 | |
| Lilly USA, LLC | 3 | $59.82 | |
| Janssen Biotech, INC. | 3 | $57.82 | |
| Ironwood Pharmaceuticals, INC | 2 | $48.02 | |
| Regeneron Healthcare Solutions, INC. | 1 | $31.57 | |
| Genzyme Corporation | 1 | $31.38 | |
| Aimmune Therapeutics, INC. | 1 | $28.21 | |
| Exact Sciences Corporation | 1 | $27.14 | |
| Ferring Pharmaceuticals INC. | 1 | $22.71 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
778
Patients
302
Total drug cost
$169,153
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 211 | 77 | $4,378 |
| Pantoprazole Sodium | Generic | 143 | 58 | $2,579 |
| Famotidine | Generic | 64 | 21 | $1,060 |
| Linzess (Linaclotide) | Brand | 58 | 20 | $75,256 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 54 | 54 | $9,642 |
| Dicyclomine Hcl | Generic | 39 | 16 | $821 |
| Esomeprazole Magnesium | Generic | 31 | 0 | $2,839 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 30 | 30 | $2,446 |
| Dexlansoprazole Dr (Dexlansoprazole) | Brand | 29 | 0 | $7,810 |
| Sutab (Sod Sulf/Pot Chloride/Mag Sulf) | Brand | 28 | 26 | $4,808 |
Frequently asked questions
What is Dr. Douglas Grunwald's medical specialty?
Dr. Douglas Grunwald practices Gastroenterology Physician in Hamden, CT.
Where does Dr. Douglas Grunwald practice?
Dr. Douglas Grunwald practices at 2200 Whitney Ave Ste 360, Hamden, CT 065183602. Office phone: 2032814463.
What is Dr. Douglas Grunwald's NPI?
Dr. Douglas Grunwald's National Provider Identifier (NPI) is 1154616001, issued by NPPES.
Does Dr. Douglas Grunwald accept Medicare assignment?
Yes. Dr. Douglas Grunwald accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Douglas Grunwald commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.