Mark L. Grosko, D.D.S.
Endodontics · Newark, OH
Mark L. Grosko, D.D.S. is an endodontics with a practice address in Newark, Ohio, and NPI 1265614861, issued on Dec 5, 2007. Check the license (Ohio 21555, as entered in NPPES) with the Ohio board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark L. Grosko
- Credential
- D.D.S.
- Primary taxonomy
- Endodontics 1223E0200X
- License number
- 21555 OH
Self-reported in NPPES; status is on the state search - Practice location
- 843 N 21St St, Newark, OH 43055
- Phone
- (740) 344-6349
- Enumerated
- Dec 5, 2007
- Record last updated
- Sep 27, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (740) 344-6350
- Medicaid ID
- 2424693 OH
- Entity
- Type 1 · individual
8 nearest endodontics records → All 186 in Ohio → Look up another NPI →
Also registered at 843 N 21St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Geoffrey Bauman, DMD MSPeriodontics1699880260
Verify Mark L. Grosko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Ohio board licenses this profession
Search for license 21555Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average endodontics in 2024
321 Medicare Part D claims for 187 beneficiaries, against an average of 121 among the 4,119 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 16 claims were for opioids.
Most prescribed
- Amoxicillin137 claims
- Methylprednisolone65 claims
- Clindamycin Hcl46 claims
- Chlorhexidine Gluconate32 claims
- Metronidazole12 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.
Mark L. Grosko among 186 endodontics records in Ohio
Mark L. Grosko, D.D.S. is one of 186 endodontics records with a practice address in Ohio. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 34% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · 0% of these records are
- Record last updated2011 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223E0200X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endodontics providers in Ohio
There are 186 endodontics records in Ohio.
All 186 in Ohio → Every provider in Newark → Endodontics nationwide →
The 8 endodontics records with the nearest ZIP codes
- Christopher Ettrich, D.D.S., M.S.D.Powell, OH 430651598751844
- Michael Tilson, D.D.S.Reynoldsburg, OH 430681013191402
- Don Wilkins, D.D.S.,M.S.Reynoldsburg, OH 430681154539682
- Alfred Heller, DDSLewis Center, OH 430351336270545
- Saadia Bukhari, D.D.S.Westerville, OH 430811568563757
- Kathryn Watkins Younkin, DDS MSWesterville, OH 430821174702070
- Kevin Younkin, DDS, MSWesterville, OH 430821093994527
- Jean Scott, D.D.S., M.S.Hilliard, OH 430261962449298
Common questions
What is Mark L. Grosko, D.D.S.'s NPI number?
Mark L. Grosko, D.D.S.'s National Provider Identifier (NPI) is 1265614861, issued on Dec 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark L. Grosko, D.D.S. located?
The NPPES record lists a practice address at 843 N 21St St, Newark, OH, 43055. Phone: (740) 344-6349. Providers update this record themselves, so call before visiting.
How can I verify Mark L. Grosko, D.D.S.'s license?
NPPES lists Ohio license number 21555, as entered by the provider. Search the Ohio board that licenses this profession; the NPPES record confirms identity only.
How much does Mark L. Grosko, D.D.S. prescribe under Medicare Part D?
In 2024, Mark L. Grosko, D.D.S. had 321 Medicare Part D claims for 187 beneficiaries; the average among endodontics prescribers was 121. Part D covers Medicare prescriptions only.
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.