Mark Sobczak, MD
NPI 1164422523 · Radiation Oncology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sobczak, MD is a Radiation Oncology Physician provider in Philadelphia, PA (NPI 1164422523).
Provider details
- NPI number
- 1164422523
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- D0060531 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
89 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 73 | $44 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 16 | $195 |
Typical Medicare-allowed amounts for these services range $44–$195 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 211 S Gulph Rd Ste 200King of Prussia, PA 19406-3101Phone: (610) 382-5900Fax: (610) 382-5919
Registry dates
- Enumerated
- 2005-07-28
- Last updated
- 2018-06-06
Frequently asked questions
- What is Mark Sobczak's NPI number?
- Mark Sobczak's National Provider Identifier (NPI) is 1164422523, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sobczak's specialty?
- Mark Sobczak is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sobczak located?
- Mark Sobczak's practice location on file with NPPES is 333 Cottman Ave, Philadelphia, PA 19111.
- What is Mark Sobczak's phone number?
- The practice phone number listed in the NPPES registry for Mark Sobczak is (215) 728-2581.
- Does Mark Sobczak accept Medicare?
- Mark Sobczak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sobczak's NPI active?
- Yes — Mark Sobczak's NPI (1164422523) is active in the NPPES registry as of the last update on 2018-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.