CHARLES MAXWELL SHANNON
NPI 1659831584
Internal Medicine - Critical Care Medicine in Houston, TX
About Charles Maxwell Shannon NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHARLES MAXWELL SHANNON (NPI 1659831584) is an individual critical care medicine provider in Houston, Texas, licensed in Texas (T7037) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Harris Health System, and maintains a secondary practice location in Houston.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
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
Charles Maxwell Shannon 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 Reassignment
Medicare enrollment records show Charles Shannon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 2,296 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Harris Health System
Acute Care Hospitals · Houston, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77030 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 Charles Shannon's NPI number?
The NPI number for Charles Shannon is 1659831584. It was assigned to this individual provider in the NPPES registry on March 25, 2019.
Where is Charles Shannon located?
Charles Shannon practices at 1504 Taub Loop, Houston, TX 77030. The listed phone number is (713) 873-8890.
What is Charles Shannon's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Charles Shannon enrolled in Medicare?
Yes. Charles Shannon 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 organization bills Medicare for Charles Shannon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Charles Shannon reassigns Medicare benefits to Baylor College Of Medicine (Houston, TX). The 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 Charles Shannon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Charles Shannon accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 1 other insurer list Charles Shannon 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 Charles Shannon affiliated with any hospitals?
According to CMS data, Charles Shannon is affiliated with Harris Health System.
When was this NPI record last updated?
The NPPES record for Charles Shannon was last updated on August 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Charles Maxwell Shannon · NPI 1659831584
Critical Care Medicine physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since March 25, 2019.
## Identity
- **NPI:** 1659831584 (Entity type: Individual)
- **Enumerated:** March 25, 2019
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** T7037 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1504 TAUB LOOP, Houston, TX 77030-1608
- **Phone:** (713) 873-8890
## 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:** Baylor College Of Medicine (NPI 1053352914, Houston, TX), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Baylor College Of Medicine, class of 2019
## Record status
- **NPPES last updated:** August 4, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1659831584) · Data from the CMS NPPES public registry.