Doctor profile · Federal record
Dr. Gregory Rihacek, MD
Rheumatology Physician (CMS: Internal Medicine) · Somerset, NJ
- NPI 1114992773
- Accepts Medicare
- MIPS 23.4 / 100 · 2023
- 44 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
19 Clyde RD, #101
Somerset, NJ 088735042
(732) 568-0023
fax (732) 568-0159
Credentials & registration
- NPI registered
- February 2006 — 20 yrs on file
- Profile last updated
- March 25, 2010
- Year of graduation
- 1982 — 44 yrs since
- Specialty taxonomy
- 207RR0500X — NUCC code
- State license (1)
- New Jersey #25MA06373000
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1114992773. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,548
Distinct HCPCS
10
Medicare allowed
$159,555
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 873 | 264 | $139 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 157 | 64 | $98 | |
J1100 |
Injection, dexamethasone sodium phosphate, 1 mg | 94 | 43 | $0 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 67 | 67 | $183 | |
J1030 |
Injection, methylprednisolone acetate, 40 mg | 65 | 28 | $8 | |
36415 |
Insertion of needle into vein for collection of blood sample | 52 | 31 | $8 | |
85651 |
Red blood cell sedimentation rate, to detect inflammation, non-automated | 48 | 30 | $4 | |
20610 |
Aspiration and/or injection of fluid from large joint | 46 | 20 | $75 | |
96372 |
Injection of drug or substance under skin or into muscle | 36 | 18 | $16 | |
96401 |
Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle | 29 | 20 | $82 |
In context: peer comparison
Among 1 peers in this city , average services per provider: 110. This provider delivers 14× the peer median.Open Payments
Industry payments received
All-time total
$14,750
Transactions
226
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ANI Pharmaceuticals, Inc. | 20 | $5,552.78 | |
| Amgen Inc. | 35 | $3,910.28 | |
| ABBVIE INC. | 43 | $2,141.93 | |
| Janssen Biotech, Inc. | 48 | $1,267.29 | |
| AstraZeneca Pharmaceuticals LP | 9 | $226.79 | |
| GENZYME CORPORATION | 7 | $223.58 | |
| Mallinckrodt Hospital Products Inc. | 7 | $199.33 | |
| Boehringer Ingelheim Pharmaceuticals, Inc. | 5 | $185.14 | |
| UCB, Inc. | 11 | $171.24 | |
| PFIZER INC. | 11 | $167.39 | |
| Novartis Pharmaceuticals Corporation | 10 | $161.44 | |
| Radius Health, Inc. | 4 | $155.47 | |
| Organon Llc | 8 | $120.41 | |
| Aurinia Pharma U.S., Inc. | 4 | $67.61 | |
| GlaxoSmithKline, LLC. | 4 | $59.75 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,985
Patients
432
Total drug cost
$832,691
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 326 | 89 | $3,585 |
| Oxycodone Hcl | Generic | 223 | 20 | $10,306 |
| Hydroxychloroquine Sulfate | Generic | 213 | 57 | $11,384 |
| Meloxicam | Generic | 149 | 35 | $912 |
| Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) | Brand | 134 | 28 | $7,307 |
| Alprazolam | Generic | 121 | 17 | $2,039 |
| Methotrexate (Methotrexate Sodium) | Brand | 121 | 36 | $4,448 |
| Tramadol Hcl | Generic | 120 | 29 | $1,881 |
| Leflunomide | Generic | 104 | 24 | $7,692 |
| Gabapentin | Generic | 97 | 21 | $1,125 |
Hospital affiliations
Frequently asked questions
What is Dr. Gregory Rihacek's medical specialty?
Dr. Gregory Rihacek practices Rheumatology Physician in Somerset, NJ.
Where does Dr. Gregory Rihacek practice?
Dr. Gregory Rihacek practices at 19 Clyde RD, Somerset, NJ 088735042. Office phone: 7325680023.
What is Dr. Gregory Rihacek's NPI?
Dr. Gregory Rihacek's National Provider Identifier (NPI) is 1114992773, issued by NPPES.
Does Dr. Gregory Rihacek accept Medicare assignment?
Yes. Dr. Gregory Rihacek accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Rihacek commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Injection, dexamethasone sodium phosphate, 1 mg (HCPCS J1100). Source: CMS Medicare Physician & Other Practitioners file.