Mark L. Sobczak, MD
Radiation Oncology Physician · Philadelphia, PA
Mark L. Sobczak, MD is a radiation oncology physician with a practice address in Philadelphia, Pennsylvania, and NPI 1164422523, issued on Jul 28, 2005. Check the license (Pennsylvania MD-045641-L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mark L. Sobczak
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- MD-045641-L PA
C1-0007087 DE
36651 KY
D0060531 MD
0101046483 VA
Self-reported in NPPES; status is on the state search - Practice location
- 333 Cottman Ave, Philadelphia, PA 19111
- Phone
- (215) 728-2581
- Enumerated
- Jul 28, 2005
- Record last updated
- Jun 6, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (215) 214-4038
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 383 in Pennsylvania → Look up another NPI →
Also registered at 333 Cottman Ave
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- Allison Aggon, D.O.Surgery Physician1972759900
- Tahseen Al-Saleem, M.D.Anatomic Pathology & Clinical Pathology Physician1962474056
- Md Usman Ali, M.D.Internal Medicine Physician1619316882
Verify Mark L. Sobczak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD-045641-LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 76.7 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).
Mark L. Sobczak among 383 radiation oncology physician records in Pennsylvania
Mark L. Sobczak, MD is one of 383 radiation oncology physician records with a practice address in Pennsylvania. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 83% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 75% of these records are
- Record last updated2018 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Pennsylvania
There are 383 radiation oncology physician records in Pennsylvania.
All 383 in Pennsylvania → Every provider in Philadelphia → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Penny Anderson, M.D.Philadelphia, PA 191111811969868
- Jo Ann Chalal, MDPhiladelphia, PA 191111316944424
- Randi Cohen, MDPhiladelphia, PA 191111366570228
- Thomas Galloway, MDPhiladelphia, PA 191111710052212
- Mark Hallman, M.D., PH.D.Philadelphia, PA 191111124256557
- Arthur Harvey, MDPhiladelphia, PA 191111962425843
- Shelly Hayes, MDPhiladelphia, PA 191111346457918
- Eric Horwitz, M.D.Philadelphia, PA 191111952322679
Common questions
What is Mark L. Sobczak, MD's NPI number?
Mark L. Sobczak, MD's National Provider Identifier (NPI) is 1164422523, issued on Jul 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark L. Sobczak, MD located?
The NPPES record lists a practice address at 333 Cottman Ave, Philadelphia, PA, 19111. Phone: (215) 728-2581. Providers update this record themselves, so call before visiting.
How can I verify Mark L. Sobczak, MD's license?
NPPES lists Pennsylvania license number MD-045641-L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Mark L. Sobczak, MD's MIPS final score?
The 2023 MIPS final score is 76.7 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.