DR. KAREN SHAKITA RIGGINS M.D., PH.D.
NPI 1629497953
Internal Medicine - Hematology & Oncology in Houston, TX
About Dr. Karen Shakita Riggins M.d., Ph.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KAREN SHAKITA RIGGINS M.D., PH.D. (NPI 1629497953) is an individual hematology & oncology provider in Houston, Texas, licensed in Texas (S6723) and active in the NPI registry since April 2014. She is enrolled in Medicare PECOS, is affiliated with Harris Health System, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
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. Karen Shakita Riggins M.d., Ph.d. 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 Karen Riggins reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 2,296 clinicians in this Medicare group
Mcalester, OK 74501
- Reassigned Medicare billing, Oklahoma enrollment
- Medicare enrollment name: Warren Clinic Inc
- 1,144 clinicians in this Medicare group
Tulsa, OK 74136
- Reassigned Medicare billing, Oklahoma enrollment
- 98 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 3
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.
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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Karen Riggins's NPI number?
The NPI number for Karen Riggins is 1629497953. It was assigned to this individual provider in the NPPES registry on April 15, 2014.
Where is Karen Riggins located?
Karen Riggins practices at 1504 Taub Loop, Houston, TX 77030. The listed phone number is (713) 873-8890.
What is Karen Riggins's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Karen Riggins enrolled in Medicare?
Yes. Karen Riggins 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 Karen Riggins's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Riggins reassigns Medicare benefits to 3 organizations: Baylor College Of Medicine (Houston, TX), Warren Clinics Inc (Mcalester, OK) and Saint Francis Hospital, Inc. (Tulsa, OK). 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 Karen Riggins's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Riggins accept?
Health plans from Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas, Community Health Choice and CommunityCare list Karen Riggins 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 Karen Riggins affiliated with any hospitals?
According to CMS data, Karen Riggins is affiliated with Harris Health System.
When was this NPI record last updated?
The NPPES record for Karen Riggins was last updated on February 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.
# Dr. Karen Shakita Riggins, M.D., PH.D. · NPI 1629497953
Hematology & Oncology physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since April 15, 2014.
## Identity
- **NPI:** 1629497953 (Entity type: Individual)
- **Enumerated:** April 15, 2014
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** S6723 (Texas)
- **Sole proprietor:** No
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Baylor College Of Medicine (NPI 1053352914, Houston, TX); Warren Clinics Inc (NPI 1649204074, Mcalester, OK); Saint Francis Hospital, Inc. (NPI 1144228487, Tulsa, OK) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Morehouse School Of Medicine, class of 2014
## Record status
- **NPPES last updated:** February 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1629497953) · Data from the CMS NPPES public registry.