Kellen Mastick, MD
Internal Medicine Physician · South Bend, IN
Kellen Mastick, MD is an internal medicine physician with a practice address in South Bend, Indiana, and NPI 1538655709, issued on Jul 10, 2018. Check the license (Indiana 01087004A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Kellen Mastick
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 01087004A IN
15248 ND
Self-reported in NPPES; status is on the state search - Practice location
- 615 N Michigan St 1St FL Hospitalist Ste, South Bend, IN 46601
- Phone
- (574) 647-3050
- Enumerated
- Jul 10, 2018
- Record last updated
- May 1, 2023
- Fax
- (574) 647-4320
- Medicaid ID
- 300060015 IN
- Medicare enrollment
- Enrolled (PECOS I20220922002812); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,109 in Indiana → Look up another NPI →
Also registered at 615 N Michigan St 1St FL Hospitalist Ste
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Justin Chow, MDInternal Medicine Physician1700899622
Verify Kellen Mastick in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01087004ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
106 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Beacon Medical Group IncSouth Bend, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kellen Mastick among 2,109 internal medicine physician records in Indiana
Kellen Mastick, MD is one of 2,109 internal medicine physician records with a practice address in Indiana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 81% of them.
- NPI issued2018 · 81% of these records are older, 17% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2018 · median 2005 among the 1,448 with a school on file
- Record last updated2023 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
54 internal medicine physician records list a practice address in South Bend
They are 54 of the 3,178 NPPES records with a practice address in South Bend, and 2,109 internal medicine physician records in Indiana.
All 2,109 in Indiana → Every provider in South Bend → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sylvana Atallah, M.D.South Bend, IN 466011225235336
- Justin Chow, MDSouth Bend, IN 466011700899622
- Robert Einterz, MDSouth Bend, IN 466011992762652
- Celestina Iheanacho, MDSouth Bend, IN 466011619927530
- Mathew Kallookulangara, M.D.South Bend, IN 466011912998642
- Carolyn Klaus, M.D.South Bend, IN 466011811988561
- Wen Sun Lum, MDSouth Bend, IN 466011497781124
- Monika Niemiec, MDSouth Bend, IN 466011063610327
Common questions
What is Kellen Mastick, MD's NPI number?
Kellen Mastick, MD's National Provider Identifier (NPI) is 1538655709, issued on Jul 10, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Kellen Mastick, MD located?
The NPPES record lists a practice address at 615 N Michigan St 1St FL Hospitalist Ste, South Bend, IN, 46601. Phone: (574) 647-3050. Providers update this record themselves, so call before visiting.
How can I verify Kellen Mastick, MD's license?
NPPES lists Indiana license number 01087004A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kellen Mastick, MD prescribe under Medicare Part D?
In 2024, Kellen Mastick, MD had 106 Medicare Part D claims for 53 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.