MARK D MARILLEY MD
NPI 1407852353
Internal Medicine - Gastroenterology in Stuart, FL
About Mark D Marilley Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK D MARILLEY MD (NPI 1407852353) is an individual gastroenterology provider in Stuart, Florida, licensed in Florida (ME157995) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Adventhealth Ocala, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 7
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
Mark D Marilley 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
5Medicare enrollment records show Mark Marilley reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tampa, FL 33613
- Reassigned Medicare billing, Florida enrollment
- 1,719 clinicians in this Medicare group
Bolivia, NC 28422
- Reassigned Medicare billing, North Carolina enrollment
- 930 clinicians in this Medicare group
Rocky Mount, NC 27804
- Reassigned Medicare billing, North Carolina enrollment
- 205 clinicians in this Medicare group
Elizabethtown, KY 42701
- Reassigned Medicare billing, Kentucky enrollment
- 967 clinicians in this Medicare group
Miles City, MT 59301
- Reassigned Medicare billing, Montana enrollment
- 1,264 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
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.
Adventhealth Ocala
Acute Care Hospitals · Ocala, FLAdventhealth Fish Memorial
Acute Care Hospitals · Orange City, FLHca Florida Lawnwood Hospital
Acute Care Hospitals · Fort Pierce, FLEastern Idaho Regional Medical Center
Acute Care Hospitals · Idaho Falls, IDBaptist Health Hardin
Acute Care Hospitals · Elizabethtown, KYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 34994 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.
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 Mark Marilley's NPI number?
The NPI number for Mark Marilley is 1407852353. It was assigned to this individual provider in the NPPES registry on June 24, 2005.
Where is Mark Marilley located?
Mark Marilley practices at 200 SE Hospital Ave, Stuart, FL 34994. The listed phone number is (772) 287-5200.
What is Mark Marilley's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mark Marilley enrolled in Medicare?
Yes. Mark Marilley 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 Mark Marilley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Marilley reassigns Medicare benefits to 5 organizations: Florida Hospital Physician Group Inc (Tampa, FL), East Carolina University (Bolivia, NC), Nhcs Physicians Inc (Rocky Mount, NC), Baptist Health Medical Group Inc (Elizabethtown, KY) and Billings Clinic (Miles City, MT). 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 Mark Marilley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Marilley accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter of Tennessee, Cigna Healthcare and Providence Health Plan list Mark Marilley 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 Mark Marilley affiliated with any hospitals?
According to CMS data, Mark Marilley is affiliated with Adventhealth Ocala, Adventhealth Fish Memorial, Hca Florida Lawnwood Hospital, Eastern Idaho Regional Medical Center and Baptist Health Hardin.
When was this NPI record last updated?
The NPPES record for Mark Marilley was last updated on June 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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.
# Mark D Marilley, MD · NPI 1407852353
Gastroenterology physician in Stuart, Florida. Individual provider, active in the CMS NPPES registry since June 24, 2005.
## Identity
- **NPI:** 1407852353 (Entity type: Individual)
- **Enumerated:** June 24, 2005
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** ME157995 (Florida)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 SE HOSPITAL AVE, Stuart, FL 34994-2346
- **Phone:** (772) 287-5200
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Florida Hospital Physician Group Inc (NPI 1174955256, Tampa, FL); East Carolina University (NPI 1427452283, Bolivia, NC); Nhcs Physicians Inc (NPI 1003028630, Rocky Mount, NC); Baptist Health Medical Group Inc (NPI 1093338527, Elizabethtown, KY); Billings Clinic (NPI 1427194836, Miles City, MT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1996
## Record status
- **NPPES last updated:** June 17, 2025
- **Other identifiers:** Other SZ970 (FL); Medicaid 3810001403 (WV); Medicaid 5906555 (NC); and 4 more
---
Source: [NPI Profile](https://npiprofile.com/npi/1407852353) · Data from the CMS NPPES public registry.