Mark Sonnenschine, D.O.
NPI 1922291939 · Hematology & Oncology Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sonnenschine, D.O. is a Hematology & Oncology Physician provider in Brooklyn, NY (NPI 1922291939).
Provider details
- NPI number
- 1922291939
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 242242 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,789 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 623 | $83 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 271 | $140 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 178 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 176 | $98 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 166 | $138 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Epoetin Alfabrand: Procrit | 39 | — |
| Mupirocin | 35 | 11 |
| Gabapentin | 33 | — |
| Oxycodone Hcl | 25 | — |
| Lanreotide Acetatebrand: Somatuline Depot | 25 | — |
| Ondansetron Hcl | 24 | 11 |
| Anastrozole | 22 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,999 across 83 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
Additional practice locations (1)
- 705 Avenue UBrooklyn, NY 11223-4133Phone: (718) 283-4232Fax: (718) 705-5804
Registry dates
- Enumerated
- 2007-08-22
- Last updated
- 2026-02-04
- Certified
- 2026-02-04
Frequently asked questions
- What is Mark Sonnenschine's NPI number?
- Mark Sonnenschine's National Provider Identifier (NPI) is 1922291939, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sonnenschine's specialty?
- Mark Sonnenschine is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sonnenschine located?
- Mark Sonnenschine's practice location on file with NPPES is 6201 15th Ave # 305, Brooklyn, NY 11219-5411.
- What is Mark Sonnenschine's phone number?
- The practice phone number listed in the NPPES registry for Mark Sonnenschine is (718) 775-2700.
- Does Mark Sonnenschine accept Medicare?
- Mark Sonnenschine is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sonnenschine's NPI active?
- Yes — Mark Sonnenschine's NPI (1922291939) is active in the NPPES registry as of the last update on 2026-02-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.