TONYA L GRAY MD
NPI 1427164201
Family Medicine in Mason City, IA
About Tonya L Gray Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TONYA L GRAY MD (NPI 1427164201) is an individual family medicine provider in Mason City, Iowa, licensed in Iowa (MD-35644) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of University Of Iowa, Rj & L Carver College Of Medicine (1998).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Tonya L Gray Md 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
3Medicare enrollment records show Tonya Gray reassigns Medicare billing to 3 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
Belmond, IA 50421
- Reassigned Medicare billing, Iowa enrollment
- 164 clinicians in this Medicare group
Clarion, IA 50525
- Reassigned Medicare billing, Iowa enrollment
- 166 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 5
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
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, 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.
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 10
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MASON CITY, IA 50401
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 Tonya Gray's NPI number?
The NPI number for Tonya Gray is 1427164201. It was assigned to this individual provider in the NPPES registry on August 22, 2006.
Where is Tonya Gray located?
Tonya Gray practices at 520 S Pierce Ave, Mason City, IA 50401. The listed phone number is (844) 474-4321.
What is Tonya Gray's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Tonya Gray enrolled in Medicare?
Yes. Tonya Gray 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 Tonya Gray's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tonya Gray reassigns Medicare benefits to 3 organizations: North Iowa Mercy Clinics (Mason City, IA), Belmond Community Hospital (Belmond, IA) and Iowa Specialty Hospital- Clarion (Clarion, 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 Tonya Gray's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Tonya Gray accept?
Health plans from Wellmark Health Plan of Iowa, Inc. list Tonya Gray 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 Tonya Gray affiliated with any hospitals?
According to CMS data, Tonya Gray is affiliated with Mercyone North Iowa Medical Center.
When was this NPI record last updated?
The NPPES record for Tonya Gray was last updated on August 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 59 days 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.
# Tonya L Gray, MD · NPI 1427164201
Family Medicine physician in Mason City, Iowa. Individual provider, active in the CMS NPPES registry since August 22, 2006.
## Identity
- **NPI:** 1427164201 (Entity type: Individual)
- **Enumerated:** August 22, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** MD-35644 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 520 S PIERCE AVE, Mason City, IA 50401-2749
- **Phone:** (844) 474-4321 · **Fax:** (641) 428-9219
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): North Iowa Mercy Clinics (NPI 1043321102, Mason City, IA); Belmond Community Hospital (NPI 1821122623, Belmond, IA); Iowa Specialty Hospital- Clarion (NPI 1396760153, Clarion, IA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Iowa, Rj & L Carver College Of Medicine, class of 1998
## Record status
- **NPPES last updated:** August 26, 2026
- **Other identifiers:** Other 37238 (IA); Medicaid 0447698 (IA)
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Source: [NPI Profile](https://npiprofile.com/npi/1427164201) · Data from the CMS NPPES public registry.