Frederick Fellin, MD
NPI 1679684476 · Hematology & Oncology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frederick Fellin, MD is a Hematology & Oncology Physician provider in Philadelphia, PA (NPI 1679684476).
Provider details
- NPI number
- 1679684476
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD025210E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
624 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 228 | $99 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 98 | $146 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 83 | $67 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 76 | $17 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 46 | $79 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 144 | 52 |
| Palbociclibbrand: Ibrance | 66 | 11 |
| Tamoxifen Citrate | 41 | 13 |
| Ibrutinibbrand: Imbruvica | 36 | — |
| Osimertinib Mesylatebrand: Tagrisso | 35 | — |
| Exemestane | 32 | 13 |
| Hydroxyurea | 29 | — |
| Apixaban |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-31
- Last updated
- 2013-02-15
Frequently asked questions
- What is Frederick Fellin's NPI number?
- Frederick Fellin's National Provider Identifier (NPI) is 1679684476, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frederick Fellin's specialty?
- Frederick Fellin is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Frederick Fellin located?
- Frederick Fellin's practice location on file with NPPES is 925 Chestnut Street, Philadelphia, PA 19107-5109.
- What is Frederick Fellin's phone number?
- The practice phone number listed in the NPPES registry for Frederick Fellin is (215) 955-8874.
- Does Frederick Fellin accept Medicare?
- Frederick Fellin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Frederick Fellin's NPI active?
- Yes — Frederick Fellin's NPI (1679684476) is active in the NPPES registry as of the last update on 2013-02-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.