DR. DEREK DUANE MOUNSEY DO, MHA
NPI 1205464203
Internal Medicine in Carmel, IN
About Dr. Derek Duane Mounsey Do, Mha NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DEREK DUANE MOUNSEY DO, MHA (NPI 1205464203) is an individual internal medicine provider in Carmel, Indiana, licensed in Indiana (02007155A) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with Ascension St Vincent Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 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
Dr. Derek Duane Mounsey Do, Mha 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 Derek Mounsey reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Indianapolis, IN 46260
- Reassigned Medicare billing, Indiana enrollment
- 945 clinicians in this Medicare group
Indianapolis, IN 46260
- Reassigned Medicare billing, Indiana enrollment
- 348 clinicians in this Medicare group
Indianapolis, IN 46260
- Reassigned Medicare billing, Indiana enrollment
- 510 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ascension St Vincent Hospital
Acute Care Hospitals · Indianapolis, INSt Vincent Heart Center
Acute Care Hospitals · Carmel, INPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 46290 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
INDIANAPOLIS, IN 46290
INDIANAPOLIS, IN 46290
INDIANAPOLIS, IN 46290
INDIANAPOLIS, IN 46290
CARMEL, IN 46290
INDIANAPOLIS, IN 46290
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 Derek Mounsey's NPI number?
The NPI number for Derek Mounsey is 1205464203. It was assigned to this individual provider in the NPPES registry on March 27, 2020.
Where is Derek Mounsey located?
Derek Mounsey practices at 10590 N Meridian St, Carmel, IN 46290. The listed phone number is (317) 338-6666.
What is Derek Mounsey's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Derek Mounsey enrolled in Medicare?
Yes. Derek Mounsey 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 Derek Mounsey's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Derek Mounsey reassigns Medicare benefits to 3 organizations: St Vincent Medical Group Inc (Indianapolis, IN), Orthopaedics-Indianapolis, Inc (Indianapolis, IN) and St Vincent Physician Services Hospital And Health Care Center (Indianapolis, IN). 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 Derek Mounsey's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Derek Mounsey accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian and CareSource list Derek Mounsey 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 Derek Mounsey affiliated with any hospitals?
According to CMS data, Derek Mounsey is affiliated with Ascension St Vincent Hospital and St Vincent Heart Center.
When was this NPI record last updated?
The NPPES record for Derek Mounsey was last updated on March 19, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Derek Duane Mounsey, DO, MHA · NPI 1205464203
Internal Medicine physician in Carmel, Indiana. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1205464203 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 02007155A (Indiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 10590 N MERIDIAN ST, Carmel, IN 46290-1028
- **Phone:** (317) 338-6666
## 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): St Vincent Medical Group Inc (NPI 1558686436, Indianapolis, IN); Orthopaedics-Indianapolis, Inc (NPI 1134431125, Indianapolis, IN); St Vincent Physician Services Hospital And Health Care Center (NPI 1669422234, Indianapolis, IN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Pikeville, Kentucky College Of Osteopathic Med, class of 2020
## Record status
- **NPPES last updated:** March 19, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1205464203) · Data from the CMS NPPES public registry.