Marcus Messmer
NPI 1285070490 · Medical Oncology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus Messmer is a Medical Oncology Physician provider in Philadelphia, PA (NPI 1285070490).
Provider details
- NPI number
- 1285070490
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
304 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 160 | $99 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 120 | $147 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 24 | $184 |
Typical Medicare-allowed amounts for these services range $99–$184 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Zanubrutinibbrand: Brukinsa | 94 | 13 |
| Prednisone | 40 | 11 |
| Acalabrutinib Maleatebrand: Calquence | 33 | — |
| Ondansetron Hcl | 32 | 16 |
| Allopurinol | 30 | — |
| Olanzapine | 29 | 11 |
| Acyclovir | 26 | — |
| Tazemetostat Hydrobromide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,590 across 21 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-05-14
- Last updated
- 2021-07-07
- Certified
- 2021-07-07
Frequently asked questions
- What is Marcus Messmer's NPI number?
- Marcus Messmer's National Provider Identifier (NPI) is 1285070490, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus Messmer's specialty?
- Marcus Messmer is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus Messmer located?
- Marcus Messmer's practice location on file with NPPES is 3401 N Broad St, Philadelphia, PA 19140-5103.
- What is Marcus Messmer's phone number?
- The practice phone number listed in the NPPES registry for Marcus Messmer is (215) 707-4000.
- Does Marcus Messmer accept Medicare?
- Marcus Messmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcus Messmer's NPI active?
- Yes — Marcus Messmer's NPI (1285070490) is active in the NPPES registry as of the last update on 2021-07-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.