Medicare Enrolled
Dr. Britni Souther Mashni, DO
Hematology & Oncology · Grand Rapids, MI
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Souther Mashni from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Souther Mashni
Dr. Britni Souther Mashni is a hematology & oncology specialist in Grand Rapids, MI, with 11 years of NPI registration. Based on federal Medicare data, Dr. Souther Mashni performed 17,268 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Souther Mashni received a total of $5,551 from 60 pharmaceutical and/or device companies across 278 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Souther Mashni is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 11 years of NPI registration
▲ Top 19% volume in MI
$5,551 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗17,268
Medicare services
Top 19% in MI for hematology & oncology
Not available
Unique patients (not deduplicated)
$7
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Azacitidine chemotherapy injection An injection of the medication azacitidine, measured at 1 mg per unit. |
11,800 | $0 | $5 |
| Flow cytometry, additional marker An additional marker is tested during a flow cytometry procedure to analyze DNA or cells. This step adds specific data points to the initial analysis. |
826 | $17 | $82 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
750 | $0 | $1 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
604 | $8 | $16 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
578 | $8 | $26 |
| Anti-nausea injection (Aloxi/palonosetron) | 320 | $1 | $35 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
270 | $10 | $35 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
176 | $11 | $35 |
| Immunoglobulin level test A blood test that measures the level of gammaglobulins, which are immune system proteins. |
160 | $9 | $32 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
133 | $92 | $293 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
123 | $133 | $264 |
| Lactate dehydrogenase (LDH) level test A blood test that measures the amount of lactate dehydrogenase, an enzyme found in many body tissues. It helps assess tissue damage or disease. |
119 | $6 | $20 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
119 | $92 | $189 |
| Immunoglobulin light chain measurement A blood test that measures the levels of immunoglobulin light chains, which are proteins produced by plasma cells. |
104 | $17 | $43 |
| Reticulated platelet measurement A blood test that measures the level of young, newly formed platelets in the body. |
101 | $35 | $89 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
93 | $10 | $38 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
78 | $58 | $133 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
77 | $4 | $15 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
74 | $53 | $123 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
69 | $13 | $46 |
| Iron level test | 65 | $6 | $22 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
58 | $21 | $47 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
51 | $90 | $180 |
| Serum protein measurement A blood test that measures the total amount of protein in the serum. It helps evaluate overall health and nutritional status. |
47 | $11 | $37 |
| Enhanced Oncology Model monthly payment This code represents the monthly enhanced oncology services payment under the Enhancing Oncology Model. It covers the administrative payment for enhanced services provided to eligible patients. |
47 | $70 | $70 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
42 | $15 | $51 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
42 | $106 | $285 |
| Flow cytometry DNA or cell analysis, first marker A laboratory test that uses a laser to analyze cells or DNA by detecting a specific marker on the cell surface or within the cell. |
35 | $48 | $156 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
33 | $1 | $2 |
| New patient office visit, complex (60-74 min) | 31 | $150 | $324 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
25 | $43 | $151 |
| Transferrin level test A blood test that measures the amount of transferrin, a protein that binds to and transports iron in the body. |
24 | $12 | $40 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
22 | $14 | $50 |
| Intravenous infusion of new drug or substance, 1 hour or less This procedure involves administering a new medication or substance directly into a vein through an existing access site. The infusion is completed within one hour or less. |
22 | $45 | $145 |
| Haptoglobin level test A blood test that measures the amount of haptoglobin, a protein in the serum. It helps evaluate red blood cell breakdown. |
21 | $12 | $43 |
| Normal saline infusion, 1000 cc Administration of 1000 cc of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater solution. |
19 | $2 | $4 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
18 | $16 | $57 |
| Additional hour of intravenous hydration This code represents each additional hour of intravenous fluid administration beyond the initial hour. It is used to bill for extended hydration therapy. |
18 | $9 | $26 |
| Hepatitis B core antibody test A blood test that measures the level of antibodies to the hepatitis B core antigen. This test helps determine if a person has been infected with the hepatitis B virus. |
17 | $12 | $30 |
| Hepatitis B surface antigen test A blood test that uses an immunoassay technique to detect the presence of the hepatitis B surface antigen. This test identifies whether the hepatitis B virus is currently present in the body. |
17 | $10 | $26 |
| Beta-2 microglobulin level test A blood test that measures the level of beta-2 microglobulin, a protein produced by cells in the body. |
15 | $16 | $55 |
| Hepatitis B surface antibody test A blood test that measures the level of antibodies against the hepatitis B surface antigen. This test is used to check for immunity to hepatitis B or to verify the effectiveness of the hepatitis B vaccine. |
14 | $11 | $27 |
| Serum immunofixation test A laboratory test that analyzes a blood serum sample to identify specific abnormal proteins. The procedure uses an immunologic technique to detect and characterize these proteins. |
11 | $22 | $62 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
1.2% high complexity
77.0% medium
21.8% routine
Industry Payment Transparency
Open Payments through 2024 ↗$5,551
Total received (2018-2024)
Avg $793/year across 7 years
Top 29% in MI for hematology & oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
60
Companies
278
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,727
2023
$1,821
2022
$1,577
2021
$91
2020
$29
2019
$96
2018
$210
Payments by company (2024)
GlaxoSmithKline, LLC.
$173
Novartis Pharmaceuticals Corporation
$168
ABBVIE INC.
$143
Celgene Corporation
$138
AstraZeneca Pharmaceuticals LP
$135
Lilly USA, LLC
$100
Genentech USA, Inc.
$79
GENZYME CORPORATION
$78
Gilead Sciences, Inc.
$71
Janssen Biotech, Inc.
$63
PFIZER INC.
$63
Incyte Corporation
$58
Inari Medical, Inc.
$53
Karyopharm Therapeutics Inc.
$41
JAZZ PHARMACEUTICALS INC.
$34
Deciphera Pharmaceuticals Inc.
$31
BeiGene USA, Inc.
$29
TerSera Therapeutics LLC
$26
Ipsen Biopharmaceuticals, Inc
$25
PharmaEssentia USA Corporation
$25
Amneal Pharmaceuticals LLC
$24
Agios Pharmaceuticals, Inc.
$24
Kite Pharma, Inc.
$22
Stemline Therapeutics Inc.
$22
Acrotech Biopharma Inc.
$19
Takeda Pharmaceuticals U.S.A., Inc.
$19
Merck Sharp & Dohme LLC
$19
Daiichi Sankyo Inc.
$16
E.R. Squibb & Sons, L.L.C.
$15
Rigel Pharmaceuticals, Inc.
$14
Top 3 companies account for 28.1% of 2024 payments
All-time payments by company (2018-2024) ›
Genentech USA, Inc.
$559
Gilead Sciences, Inc.
$437
Novartis Pharmaceuticals Corporation
$318
AstraZeneca Pharmaceuticals LP
$314
GlaxoSmithKline, LLC.
$311
Lilly USA, LLC
$265
Celgene Corporation
$238
Pharmacyclics LLC, an AbbVie Company
$169
Merck Sharp & Dohme LLC
$165
ABBVIE INC.
$163
Pharmacyclics LLC, An AbbVie Company
$156
Ipsen Biopharmaceuticals, Inc
$134
Incyte Corporation
$125
GENZYME CORPORATION
$124
Janssen Biotech, Inc.
$119
PharmaEssentia USA Corporation
$118
PFIZER INC.
$111
CSL Behring
$110
Takeda Pharmaceuticals U.S.A., Inc.
$105
SANOFI-AVENTIS U.S. LLC
$100
Seagen Inc.
$96
JAZZ PHARMACEUTICALS INC.
$89
BeiGene USA, Inc.
$87
Daiichi Sankyo Inc.
$70
Amgen Inc.
$58
Alnylam Pharmaceuticals Inc.
$58
Inari Medical, Inc.
$53
Foundation Medicine, Inc.
$51
Myovant Sciences Inc.
$44
Rigel Pharmaceuticals, Inc.
$44
Bayer Healthcare Pharmaceuticals Inc.
$41
Agios Pharmaceuticals, Inc.
$41
Karyopharm Therapeutics Inc.
$41
TerSera Therapeutics LLC
$41
Blueprint Medicines Corporation
$36
TESARO, Inc.
$35
Acrotech Biopharma Inc.
$35
PUMA BIOTECHNOLOGY, INC.
$33
Novo Nordisk Inc
$32
Deciphera Pharmaceuticals Inc.
$31
Sobi, Inc
$28
Boehringer Ingelheim Pharmaceuticals, Inc.
$27
Eisai Inc.
$25
EISAI INC.
$24
Amneal Pharmaceuticals LLC
$24
Kyowa Kirin, Inc.
$23
Kite Pharma, Inc.
$22
Bayer HealthCare Pharmaceuticals Inc.
$22
Stemline Therapeutics Inc.
$22
Alexion Pharmaceuticals, Inc.
$20
AbbVie Inc.
$20
Puma Biotechnology, Inc.
$18
Emmaus Medical, Inc.
$18
Epizyme, Inc.,
$18
SOBI, INC
$17
E.R. Squibb & Sons, L.L.C.
$15
Pharmacosmos Therapeutics Inc.
$14
CTI BioPharma Corp.
$14
Mirati Therapeutics, Inc.
$13
ADC Therapeutics America, Inc.
$12
Top 3 companies account for 23.7% of all-time payments
Associated products mentioned in payments ›
ADAKVEO · ADCETRIS · ALUNBRIG · AVASTIN · AYVAKIT · Alecensa · BELEODAQ · BESREMI · BLENREP · BOSULIF · BRUKINSA · CABLIVI · CALQUENCE · CARVYKTI · Columvi · DOPTELET · Doptelet · ENHERTU · EPKINLY · ERLEADA · Endari · Enhertu · Esperoct · FLOWTRIEVER CATHETER · FOUNDATIONONE · FOUNDATIONONE LIQUID CDX · Fabhalta · GAZYVA · GILOTRIF · GIVLAARI · Gazyva · Hizentra · IBRANCE · IMBRUVICA · INJECTAFER · INLYTA · JAKAFI · JEVTANA · KEYTRUDA · KISQALI · KRAZATI · Kadcyla · Kyprolis · LUMAKRAS · LYNPARZA · Lenvima · MONJUVI · MONOFERRIC · NERLYNX · NINLARO · Nplate · Nubeqa · OJJAARA · ONGLYZA · OPDIVO · ORGOVYX · Onivyde · Orserdu · PLUVICTO · PROMACTA · PYRUKYND · Perjeta · Pomalyst · Poteligeo · QINLOCK · REBLOZYL · RETEVMO · Rebinyn · Rezlidhia · S · SARCLISA · SCEMBLIX · SOMATULINE DEPOT · Stivarga · TAZVERIK · TECENTRIQ · TECVAYLI · TUKYSA · Tazverik · Trodelvy · ULTOMIRIS · VENCLEXTA · VERZENIO · Venclexta · Vitrakvi · Vonjo · XPOVIO · Xermelo · Yescarta · ZEJULA · ZEPZELCA · Zoladex
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Hematology & oncology specialists in nearby ZIP areas
23
County median income
$80,390
Nearest hospital to ZIP centroid (approximate)
SPECTRUM HEALTH
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Souther Mashni is a mixed practice specialist, with above-average Medicare volume (top 19% in MI).
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Souther Mashni experienced with azacitidine chemotherapy injection?
Based on Medicare claims data, Dr. Souther Mashni performed 11,800 azacitidine chemotherapy injection services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Souther Mashni receive payments from pharmaceutical companies?
Yes. Dr. Souther Mashni received a total of $5,551 from 60 companies across 278 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Souther Mashni's costs compare to other hematology & oncology specialists in Grand Rapids?
Dr. Souther Mashni's average Medicare payment per service is $7. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Souther Mashni) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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