Tomasz K. Grochowalski, M.D.
Internal Medicine Physician · South Amboy, NJ
Tomasz K. Grochowalski, M.D. is an internal medicine physician with a practice address in South Amboy, New Jersey, and NPI 1265495980, issued on Apr 11, 2006. Check the license (New Jersey MA065561, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Tomasz K. Grochowalski
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MA065561 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 2045 State Route 35, South Amboy, NJ 08879
- Phone
- (732) 721-5511
- Enumerated
- Apr 11, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (732) 721-2007
- Medicare enrollment
- Enrolled (PECOS I20040518000762); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 2045 State Route 35
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Janet Crain, DMDDentist1023125150
- Ira Klemons, DDS PHDDentist1841393386
Verify Tomasz K. Grochowalski 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 MA065561Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% more Medicare Part D claims than the average internal medicine physician in 2024
6,142 Medicare Part D claims for 583 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 13 claims were for opioids.
Most prescribed
- Amlodipine Besylate662 claims
- Atorvastatin Calcium445 claims
- Rosuvastatin Calcium356 claims
- Metformin Hcl272 claims
- Levothyroxine Sodium223 claims
- Pravastatin Sodium223 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 practice group's MIPS final score for 2023 (Medicare payment program): 75.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $82.83
4 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. 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.
Bills Medicare through one group practice
- Hackensack Meridian Health Medical Group - Specialty Care PCAvenel, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tomasz K. Grochowalski among 4,632 internal medicine physician records in New Jersey
Tomasz K. Grochowalski, 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
- Graduated1981 · 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).
6 internal medicine physician records list a practice address in South Amboy
They are 6 of the 165 NPPES records with a practice address in South Amboy, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in South Amboy → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hani Batarseh, MDSouth Amboy, NJ 088791114907557
- Maria Khan, MDSouth Amboy, NJ 088791962066126
- Harold McKenna, MDSouth Amboy, NJ 088791609959550
- Rodolfo Ouano, M.D.South Amboy, NJ 088791568552917
- Lilly Rathi, MDSouth Amboy, NJ 088791912006982
- Irina Shumskaya, MDLaurence Harbor, NJ 088791134377054
- Jeffrey Kaladas, M.D.South Bound Brook, NJ 088801295758258
- George Yastine, M.D.South Bound Brook, NJ 088801922243872
Common questions
What is Tomasz K. Grochowalski, M.D.'s NPI number?
Tomasz K. Grochowalski, M.D.'s National Provider Identifier (NPI) is 1265495980, issued on Apr 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tomasz K. Grochowalski, M.D. located?
The NPPES record lists a practice address at 2045 State Route 35, South Amboy, NJ, 08879. Phone: (732) 721-5511. Providers update this record themselves, so call before visiting.
How can I verify Tomasz K. Grochowalski, M.D.'s license?
NPPES lists New Jersey license number MA065561, 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 Tomasz K. Grochowalski, M.D. prescribe under Medicare Part D?
In 2024, Tomasz K. Grochowalski, M.D. had 6,142 Medicare Part D claims for 583 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Tomasz K. Grochowalski, M.D.'s MIPS final score?
The 2023 MIPS final score is 75.8 of 100, reported for the practice group. 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.