DR. MARK EDWARD HENNESSY M.D.
NPI 1194784728
Internal Medicine in Houston, TX
About Dr. Mark Edward Hennessy M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK EDWARD HENNESSY M.D. (NPI 1194784728) is an individual internal medicine provider in Houston, Texas, licensed in Texas (N4468) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Houston, and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 4
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Mark Edward Hennessy M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
5Medicare enrollment records show Mark Hennessy reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77054
- Reassigned Medicare billing, Texas enrollment
- 2 clinicians in this Medicare group
Richmond, TX 77407
- Reassigned Medicare billing, Texas enrollment
- 2 clinicians in this Medicare group
Brookshire, TX 77423
- Reassigned Medicare billing, Texas enrollment
- 3 clinicians in this Medicare group
East Bernard, TX 77435
- Reassigned Medicare billing, Texas enrollment
- 2 clinicians in this Medicare group
Beaumont, TX 77706
- Reassigned Medicare billing, Texas enrollment
- 351 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77045 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 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HOUSTON, TX 77045
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 Hennessy's NPI number?
The NPI number for Mark Hennessy is 1194784728. It was assigned to this individual provider in the NPPES registry on March 22, 2006.
Where is Mark Hennessy located?
Mark Hennessy practices at 14215 S Post Oak Rd, Houston, TX 77045. The listed phone number is (832) 541-8360.
What is Mark Hennessy's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Hennessy enrolled in Medicare?
Yes. Mark Hennessy is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mark Hennessy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Hennessy reassigns Medicare benefits to 5 organizations: Southwest Family Clinic PC (Houston, TX), Richmond Primemed Clinic,llc (Richmond, TX), Athena Medical Clinic LLC (Brookshire, TX), East Bernard Primemed Clinic (East Bernard, TX) and Doctors Express Of The Beaumont Area PA (Beaumont, TX). 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 Hennessy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Hennessy accept?
Health plans from Blue Cross and Blue Shield of Texas and Imperial Insurance Companies, Inc. list Mark Hennessy 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.
When was this NPI record last updated?
The NPPES record for Mark Hennessy was last updated on April 29, 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. Mark Edward Hennessy, M.D. · NPI 1194784728
Internal Medicine physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since March 22, 2006.
## Identity
- **NPI:** 1194784728 (Entity type: Individual)
- **Enumerated:** March 22, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** N4468 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 14215 S POST OAK RD, Houston, TX 77045-5233
- **Phone:** (832) 541-8360
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Southwest Family Clinic PC (NPI 1619285996, Houston, TX); Richmond Primemed Clinic,llc (NPI 1649075771, Richmond, TX); Athena Medical Clinic LLC (NPI 1760102644, Brookshire, TX); East Bernard Primemed Clinic (NPI 1346033032, East Bernard, TX); Doctors Express Of The Beaumont Area PA (NPI 1841525235, Beaumont, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** April 29, 2024
- **Other identifiers:** Other 8CQ712 (TX); Other 41696 (NC); Other 11323149 (TX); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1194784728) · Data from the CMS NPPES public registry.