Doctor profile · Federal record
Dr. Frederick Ruymann, MD
Gastroenterology Physician (CMS: Gastroenterology) · Cambridge, MA
- NPI 1568466316
- Accepts Medicare
- MIPS 79.8 / 100 · 2023
- 39 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
300 Mount Auburn St, Ste 405
Cambridge, MA 021385665
(617) 661-0221
fax (617) 661-3862
Credentials & registration
- NPI registered
- June 2005 — 21 yrs on file
- Profile last updated
- January 11, 2012
- Year of graduation
- 1987 — 39 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Massachusetts #71422
- Medicaid
- MA #3052788
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1568466316. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,160
Distinct HCPCS
10
Medicare allowed
$169,821
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 267 | 190 | $93 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 128 | 122 | $117 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 123 | 121 | $110 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 73 | 72 | $170 | |
43264 |
Removal of stone or debris from bile or pancreatic duct using a flexible endoscope | 72 | 69 | $236 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 69 | 64 | $131 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 56 | 55 | $249 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 55 | 55 | $160 | |
43262 |
Incision of pancreatic outlet using a flexible endoscope | 41 | 41 | $51 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 40 | 40 | $116 |
In context: peer comparison
Among 6 peers in this city , average services per provider: 43. This provider delivers 27× the peer median.Open Payments
Industry payments received
All-time total
$1,861
Transactions
67
Manufacturers
14
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ABBVIE INC. | 23 | $477.90 | |
| Janssen Biotech, Inc. | 8 | $362.47 | |
| Phathom Pharmaceuticals, Inc. | 4 | $201.66 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 8 | $187.52 | |
| Madrigal Pharmaceuticals | 2 | $166.73 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 6 | $134.14 | |
| Ardelyx, Inc. | 4 | $84.68 | |
| PFIZER INC. | 3 | $58.26 | |
| IRONWOOD PHARMACEUTICALS, INC | 2 | $47.92 | |
| Lilly USA, LLC | 2 | $38.02 | |
| Acera Surgical, Inc. | 1 | $31.21 | |
| Olympus America Inc. | 2 | $27.19 | |
| Ferring Pharmaceuticals Inc. | 1 | $21.86 | |
| GENZYME CORPORATION | 1 | $21.81 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
324
Patients
143
Total drug cost
$106,934
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 69 | 28 | $1,814 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 56 | 56 | $4,204 |
| Famotidine | Generic | 35 | 12 | $509 |
| Clenpiq (Sod Picosulf/Mag Ox/Citric Ac) | Brand | 33 | 33 | $5,827 |
| Creon (Lipase/Protease/Amylase) | Brand | 31 | 0 | $80,825 |
| Spironolactone | Generic | 25 | 0 | $543 |
| Omeprazole | Generic | 24 | 14 | $444 |
| Budesonide Ec (Budesonide) | Brand | 13 | 0 | $12,084 |
| Furosemide | Generic | 13 | 0 | $70 |
| Prednisone | Generic | 13 | 0 | $134 |
Frequently asked questions
What is Dr. Frederick Ruymann's medical specialty?
Dr. Frederick Ruymann practices Gastroenterology Physician in Cambridge, MA.
Where does Dr. Frederick Ruymann practice?
Dr. Frederick Ruymann practices at 300 Mount Auburn St, Cambridge, MA 021385665. Office phone: 6176610221.
What is Dr. Frederick Ruymann's NPI?
Dr. Frederick Ruymann's National Provider Identifier (NPI) is 1568466316, issued by NPPES.
Does Dr. Frederick Ruymann accept Medicare assignment?
Yes. Dr. Frederick Ruymann accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Frederick Ruymann commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43235); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.