Merl J. Mast, MERL MAST
Family Nurse Practitioner · South Bend, IN
Merl J. Mast, MERL MAST is a family nurse practitioner with a practice address in South Bend, Indiana, and NPI 1235441924, issued on Jul 9, 2010. Check the license (Indiana 71003521A, as entered in NPPES) with the Indiana board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Merl J. Mast
- Credential
- MERL MAST
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 71003521A IN
Self-reported in NPPES; status is on the state search - Practice location
- 5735 S Ironwood RD, South Bend, IN 46614
- Phone
- (574) 299-4847
- Enumerated
- Jul 9, 2010
- Record last updated
- Jul 8, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 5,867 in Indiana → Look up another NPI →
Also registered at 5735 S Ironwood RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lillian Jardine, MDFamily Medicine Physician1720188956
- Phoebe Ritter, FNP-CFamily Nurse Practitioner1124114350
Verify Merl J. Mast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Indiana board licenses this profession
Search for license 71003521ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average family nurse practitioner in 2024
199 Medicare Part D claims for 51 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Levothyroxine Sodium19 claims
- Amlodipine Besylate14 claims
- Atorvastatin Calcium13 claims
- Famotidine12 claims
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.
Merl J. Mast among 5,867 family nurse practitioner records in Indiana
Merl J. Mast, MERL MAST is one of 5,867 family nurse practitioner records with a practice address in Indiana. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 15% of them.
- NPI issued2010 · 15% of these records are older, 83% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2013 · 33% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
152 family nurse practitioner records list a practice address in South Bend
They are 152 of the 3,178 NPPES records with a practice address in South Bend, and 5,867 family nurse practitioner records in Indiana.
All 5,867 in Indiana → Every provider in South Bend → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Esther Adu, NPSouth Bend, IN 466141598593287
- Jaimee Kamp, NPSouth Bend, IN 466141346631496
- Evelin Keultjes, NPSouth Bend, IN 466141699322446
- Ruth Neal, APRNSouth Bend, IN 466141396414827
- Shelby Patterson, FNP-CSouth Bend, IN 466141710611603
- Phoebe Ritter, FNP-CSouth Bend, IN 466141124114350
- Deidre Coffey, FNPSouth Bend, IN 466151467747014
- Barbara Norris, APRN,BCSouth Bend, IN 466131780620005
Common questions
What is Merl J. Mast, MERL MAST's NPI number?
Merl J. Mast, MERL MAST's National Provider Identifier (NPI) is 1235441924, issued on Jul 9, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Merl J. Mast, MERL MAST located?
The NPPES record lists a practice address at 5735 S Ironwood RD, South Bend, IN, 46614. Phone: (574) 299-4847. Providers update this record themselves, so call before visiting.
How can I verify Merl J. Mast, MERL MAST's license?
NPPES lists Indiana license number 71003521A, as entered by the provider. Search the Indiana board that licenses this profession; the NPPES record confirms identity only.
How much does Merl J. Mast, MERL MAST prescribe under Medicare Part D?
In 2024, Merl J. Mast, MERL MAST had 199 Medicare Part D claims for 51 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.