Gregg Marella, M.D.
NPI 1922116326 · Internal Medicine Physician · Mendham, NJ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregg Marella, M.D. is a Internal Medicine Physician provider in Mendham, NJ (NPI 1922116326).
Provider details
- NPI number
- 1922116326
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MA64502 (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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,964 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 | 538 | $132 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 336 | $16 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 303 | $8 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 | 123 | $121 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 95 | $94 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 80 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 194 | 58 |
| Levothyroxine Sodium | 168 | 40 |
| Rosuvastatin Calcium | 155 | 50 |
| Amlodipine Besylate | 136 | 37 |
| Irbesartan | 79 | 22 |
| Valsartan | 71 | 15 |
| Zolpidem Tartrate | 67 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$597 across 30 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
Registry dates
- Enumerated
- 2006-08-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gregg Marella's NPI number?
- Gregg Marella's National Provider Identifier (NPI) is 1922116326, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregg Marella's specialty?
- Gregg Marella is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregg Marella located?
- Gregg Marella's practice location on file with NPPES is 19 E Main St, Mendham, NJ 07945-1503.
- What is Gregg Marella's phone number?
- The practice phone number listed in the NPPES registry for Gregg Marella is (973) 543-6505.
- Does Gregg Marella accept Medicare?
- Gregg Marella is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregg Marella's NPI active?
- Yes — Gregg Marella's NPI (1922116326) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.