SUMATHY NAGRAJ IYENGAR M.D.,
NPI 1013173723
Hospitalist in Mason City, IA
About Sumathy Nagraj Iyengar M.d., NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SUMATHY NAGRAJ IYENGAR M.D., (NPI 1013173723) is an individual hospitalist provider in Mason City, Iowa, licensed in Iowa (39427) and active in the NPI registry since August 2008. She is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of Other (1988).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Sumathy Nagraj Iyengar M.d., is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Sumathy Iyengar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mason City, IA 50401
- Reassigned Medicare billing, Iowa enrollment
- 420 clinicians in this Medicare group
Cedar Rapids, IA 52403
- Reassigned Medicare billing, Iowa enrollment
- 153 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercyone North Iowa Medical Center
Acute Care Hospitals · Mason City, IAHancock County Health System
Critical Access Hospitals · Britt, IAFranklin General Hospital
Critical Access Hospitals · Hampton, IAFloyd County Medical Center
Critical Access Hospitals · Charles City, IAKossuth Regional Health Center
Critical Access Hospitals · Algona, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 50401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MASON CITY, IA 50401
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Sumathy Iyengar's NPI number?
The NPI number for Sumathy Iyengar is 1013173723. It was assigned to this individual provider in the NPPES registry on August 1, 2008.
Where is Sumathy Iyengar located?
Sumathy Iyengar practices at 1000 4th St SW Mercy Medical Center-Hospitalist Dept, Mason City, IA 50401. The listed phone number is (641) 428-7000.
What is Sumathy Iyengar's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Sumathy Iyengar enrolled in Medicare?
Yes. Sumathy Iyengar is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Sumathy Iyengar's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sumathy Iyengar reassigns Medicare benefits to 2 organizations: North Iowa Mercy Clinics (Mason City, IA) and Cogent Healthcare Of Iowa, PC (Cedar Rapids, IA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Sumathy Iyengar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sumathy Iyengar accept?
Health plans from Oscar Health, Oscar Insurance Company and Wellmark Health Plan of Iowa, Inc. list Sumathy Iyengar as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Sumathy Iyengar affiliated with any hospitals?
According to CMS data, Sumathy Iyengar is affiliated with Mercyone North Iowa Medical Center, Hancock County Health System, Franklin General Hospital, Floyd County Medical Center and Kossuth Regional Health Center.
When was this NPI record last updated?
The NPPES record for Sumathy Iyengar was last updated on August 3, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Sumathy Nagraj Iyengar, M.D., · NPI 1013173723
Hospitalist physician in Mason City, Iowa. Individual provider, active in the CMS NPPES registry since August 1, 2008.
## Identity
- **NPI:** 1013173723 (Entity type: Individual)
- **Enumerated:** August 1, 2008
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 39427 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 1000 4TH ST SW, MERCY MEDICAL CENTER-HOSPITALIST DEPT, Mason City, IA 50401-2800
- **Phone:** (641) 428-7000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): North Iowa Mercy Clinics (NPI 1043321102, Mason City, IA); Cogent Healthcare Of Iowa, PC (NPI 1982654497, Cedar Rapids, IA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1988
## Record status
- **NPPES last updated:** August 3, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1013173723) · Data from the CMS NPPES public registry.