Gregg Gerard Marella, M.D.
Internal Medicine Physician · Mendham, NJ
Gregg Gerard Marella, M.D. is an internal medicine physician with a practice address in Mendham, New Jersey, and NPI 1922116326, issued on Aug 26, 2006. Check the license (New Jersey MA64502, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Gregg Gerard Marella
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MA64502 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 19 E Main St, Mendham, NJ 07945
- Phone
- (973) 543-6505
- Enumerated
- Aug 26, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (973) 543-2967
- Medicare enrollment
- Enrolled (PECOS I20051010000248); may accept Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 19 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Allison Connolly, M.D.Internal Medicine Physician1760740757
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- Audrey Prefer, M.D.Gynecology Physician1669417572
- Christie Prestifilippo, MDInternal Medicine Physician1336129931
- James Wolf, M.D.Geriatric Medicine (Internal Medicine) Physician1497743876
Verify Gregg Gerard Marella in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license MA64502Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% more Medicare Part D claims than the average internal medicine physician in 2024
3,312 Medicare Part D claims for 297 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 24 claims were for opioids.
Most prescribed
- Atorvastatin Calcium194 claims
- Levothyroxine Sodium168 claims
- Rosuvastatin Calcium155 claims
- Amlodipine Besylate136 claims
- Irbesartan79 claims
- Valsartan71 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 15.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $597.33
30 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Gregg Gerard Marella among 4,632 internal medicine physician records in New Jersey
Gregg Gerard Marella, M.D. is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 50% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1993 · median 2000 among the 3,132 with a school on file
- Record last updated2007 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 internal medicine physician records list a practice address in Mendham
They are 5 of the 189 NPPES records with a practice address in Mendham, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Mendham → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Allison Connolly, M.D.Mendham, NJ 079451760740757
- Sandy Furey, MDMendham, NJ 079451336350099
- Christie Prestifilippo, MDMendham, NJ 079451336129931
- Matthew Schaikewitz, MDMendham, NJ 079451215324330
- H. Burns, M.D.Morris Plains, NJ 079501538228432
- Anthony Cifelli, M.D.Morris Plains, NJ 079501245228451
- Ahdi Elias, M.D.Morris Plains, NJ 079501700808219
- Vincent Esposito, M.D.Madison, NJ 079401225008253
Common questions
What is Gregg Gerard Marella, M.D.'s NPI number?
Gregg Gerard Marella, M.D.'s National Provider Identifier (NPI) is 1922116326, issued on Aug 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregg Gerard Marella, M.D. located?
The NPPES record lists a practice address at 19 E Main St, Mendham, NJ, 07945. Phone: (973) 543-6505. Providers update this record themselves, so call before visiting.
How can I verify Gregg Gerard Marella, M.D.'s license?
NPPES lists New Jersey license number MA64502, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregg Gerard Marella, M.D. prescribe under Medicare Part D?
In 2024, Gregg Gerard Marella, M.D. had 3,312 Medicare Part D claims for 297 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Gregg Gerard Marella, M.D.'s MIPS final score?
The 2023 MIPS final score is 15.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.