Britni Souther Mashni, DO
NPI 1972996544 · Hematology & Oncology Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Britni Souther Mashni, DO is a Hematology & Oncology Physician provider in Grand Rapids, MI (NPI 1972996544).
Provider details
- NPI number
- 1972996544
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 5101021760 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,051 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 717 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 697 | $8 |
| Flow Cytometry Technique for Dna Or Cell Analysis, Each Additional Marker88185 | 472 | $21 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 338 | $10 |
| Gammaglobulin (immune System Protein) Measurement82784 | 231 | $9 |
| Measurement of Immunoglobulin Light Chains83521 | 134 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 258 | 84 |
| Acyclovir | 218 | 52 |
| Hydroxyurea | 115 | 32 |
| Dexamethasone | 82 | 24 |
| Venetoclaxbrand: Venclexta | 81 | 13 |
| Prochlorperazine Maleate | 62 | 40 |
| Tamoxifen Citrate | 59 | 16 |
| Lenalidomidebrand: Revlimid | 56 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,727 across 89 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
- 2015-03-06
- Last updated
- 2021-07-07
- Certified
- 2021-07-07
Frequently asked questions
- What is Britni Souther Mashni's NPI number?
- Britni Souther Mashni's National Provider Identifier (NPI) is 1972996544, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Britni Souther Mashni's specialty?
- Britni Souther Mashni is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Britni Souther Mashni located?
- Britni Souther Mashni's practice location on file with NPPES is 250 Cherry St Se Ste 2200, Grand Rapids, MI 49503-4608.
- What is Britni Souther Mashni's phone number?
- The practice phone number listed in the NPPES registry for Britni Souther Mashni is (616) 685-5600.
- Does Britni Souther Mashni accept Medicare?
- Britni Souther Mashni is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Britni Souther Mashni's NPI active?
- Yes — Britni Souther Mashni's NPI (1972996544) 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.