Gregory Rihacek, MD
NPI 1114992773 · Rheumatology Physician · Somerset, NJ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Rihacek, MD is a Rheumatology Physician provider in Somerset, NJ (NPI 1114992773).
Provider details
- NPI number
- 1114992773
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25MA06373000 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,526 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 984 | $133 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 187 | $94 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 75 | $9 |
| Red Blood Cell Sedimentation Rate, to Detect Inflammation, Non-Automated85651 | 73 | $4 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 69 | $174 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 105 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 359 | 94 |
| Oxycodone Hcl | 202 | 21 |
| Hydroxychloroquine Sulfate | 189 | 53 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 167 | 27 |
| Tramadol Hcl | 140 | 32 |
| Meloxicam | 134 | 33 |
| Methotrexate Sodiumbrand: Methotrexate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14,750 across 235 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 400 W Route 38 Fl 1Moorestown, NJ 08057-3219Phone: (856) 270-4002
Registry dates
- Enumerated
- 2006-02-17
- Last updated
- 2026-05-13
- Certified
- 2026-05-13
Frequently asked questions
- What is Gregory Rihacek's NPI number?
- Gregory Rihacek's National Provider Identifier (NPI) is 1114992773, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Rihacek's specialty?
- Gregory Rihacek is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Rihacek located?
- Gregory Rihacek's practice location on file with NPPES is 19 Clyde Rd, Somerset, NJ 08873-5042.
- What is Gregory Rihacek's phone number?
- The practice phone number listed in the NPPES registry for Gregory Rihacek is (732) 568-0023.
- Does Gregory Rihacek accept Medicare?
- Gregory Rihacek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Rihacek's NPI active?
- Yes — Gregory Rihacek's NPI (1114992773) is active in the NPPES registry as of the last update on 2026-05-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.