ABIGAIL NISAN MD
NPI 1336445956
Internal Medicine in San Angelo, TX
About Abigail Nisan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ABIGAIL NISAN MD (NPI 1336445956) is an individual internal medicine provider in San Angelo, Texas, licensed in Texas (P1676) and active in the NPI registry since January 2011. She is enrolled in Medicare PECOS, is affiliated with Shannon Medical Center, and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Abigail Nisan 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
6Medicare enrollment records show Abigail Nisan reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Angelo, TX 76903
- Reassigned Medicare billing, Texas enrollment
- 671 clinicians in this Medicare group
Abilene, TX 79601
- Reassigned Medicare billing, Texas enrollment
- 140 clinicians in this Medicare group
San Antonio, TX 78205
- Reassigned Medicare billing, Texas enrollment
- 478 clinicians in this Medicare group
Humble, TX 77338
- Reassigned Medicare billing, Texas enrollment
- 2,009 clinicians in this Medicare group
Port Arthur, TX 77642
- Reassigned Medicare billing, Texas enrollment
- 38 clinicians in this Medicare group
Scottsdale, AZ 85254
- Reassigned Medicare billing, Texas enrollment
- 163 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 4
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Shannon Medical Center
Acute Care Hospitals · San Angelo, TXHeart Of Texas Memorial Hospital
Critical Access Hospitals · Brady, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 76903 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.
Reported Quality Measures
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 Abigail Nisan's NPI number?
The NPI number for Abigail Nisan is 1336445956. It was assigned to this individual provider in the NPPES registry on January 28, 2011.
Where is Abigail Nisan located?
Abigail Nisan practices at 120 E Harris Ave, San Angelo, TX 76903. The listed phone number is (325) 653-6741.
What is Abigail Nisan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Abigail Nisan enrolled in Medicare?
Yes. Abigail Nisan 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 Abigail Nisan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Abigail Nisan reassigns Medicare benefits to 6 organizations: Shannon Clinic (San Angelo, TX), Quantum Emergency Physicians PA (Abilene, TX), Sound Inpatient Physicians Of Texas I, Inc (San Antonio, TX), Hospitalist Medicine Physicians Of Texas, PLLC (Humble, TX), Quantum Hospital Medicine Services Of Texas PA (Port Arthur, TX) and 1 more organization, listed in the Medicare section above. 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 Abigail Nisan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Abigail Nisan 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 4 other insurers list Abigail Nisan 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 Abigail Nisan affiliated with any hospitals?
According to CMS data, Abigail Nisan is affiliated with Shannon Medical Center and Heart Of Texas Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Abigail Nisan was last updated on January 22, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Abigail Nisan, MD · NPI 1336445956
Internal Medicine physician in San Angelo, Texas. Individual provider, active in the CMS NPPES registry since January 28, 2011.
## Identity
- **NPI:** 1336445956 (Entity type: Individual)
- **Enumerated:** January 28, 2011
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** P1676 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 120 E HARRIS AVE, San Angelo, TX 76903-5904
- **Phone:** (325) 653-6741 · **Fax:** (325) 481-2166
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Shannon Clinic (NPI 1770587149, San Angelo, TX); Quantum Emergency Physicians PA (NPI 1215010079, Abilene, TX); Sound Inpatient Physicians Of Texas I, Inc (NPI 1811321797, San Antonio, TX); Hospitalist Medicine Physicians Of Texas, PLLC (NPI 1629307095, Humble, TX); Quantum Hospital Medicine Services Of Texas PA (NPI 1568613024, Port Arthur, TX); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2008
## Record status
- **NPPES last updated:** January 22, 2015
- **Other identifiers:** Other 8EW479 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1336445956) · Data from the CMS NPPES public registry.