DR. SIGRID BIRGITTA TRISTAN M.D.
NPI 1912199563
Obstetrics & Gynecology in Austin, TX
About Dr. Sigrid Birgitta Tristan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SIGRID BIRGITTA TRISTAN M.D. (NPI 1912199563) is an individual obstetrics & gynecology provider in Austin, Texas, licensed in Texas (Q4866) and active in the NPI registry since August 2007. She is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2004).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 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. Sigrid Birgitta Tristan M.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
4Medicare enrollment records show Sigrid Tristan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Austin, TX 78712
- Reassigned Medicare billing, Texas enrollment
- 1,188 clinicians in this Medicare group
Austin, TX 78712
- Reassigned Medicare billing, Texas enrollment
- 294 clinicians in this Medicare group
Austin, TX 78712
- Reassigned Medicare billing, Texas enrollment
- 208 clinicians in this Medicare group
Austin, TX 78758
- Reassigned Medicare billing, Texas enrollment
- 240 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 78701 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.
AUSTIN, TX 78701
AUSTIN, TX 78701
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 Sigrid Tristan's NPI number?
The NPI number for Sigrid Tristan is 1912199563. It was assigned to this individual provider in the NPPES registry on August 16, 2007. The provider is also known as Dr. Sigrid Birgitta Melander M.D..
Where is Sigrid Tristan located?
Sigrid Tristan practices at 601 E 15th St, Austin, TX 78701. The listed phone number is (512) 324-7000.
What is Sigrid Tristan's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Sigrid Tristan enrolled in Medicare?
Yes. Sigrid Tristan 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 Sigrid Tristan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sigrid Tristan reassigns Medicare benefits to 4 organizations: Seton Family Of Doctors (Austin, TX), The University Of Texas At Austin (Austin, TX), University Of Texas At Austin Dell Medical School (Austin, TX) and Central Texas Community Health Centers (Austin, 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 Sigrid Tristan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sigrid Tristan 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 5 other insurers list Sigrid Tristan 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 Sigrid Tristan was last updated on March 16, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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. Sigrid Birgitta Tristan, M.D. · NPI 1912199563
Obstetrics & Gynecology physician in Austin, Texas. Individual provider, active in the CMS NPPES registry since August 16, 2007.
## Identity
- **NPI:** 1912199563 (Entity type: Individual)
- **Enumerated:** August 16, 2007
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** Q4866 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 601 E 15TH ST, Austin, TX 78701-1930
- **Phone:** (512) 324-7000
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Seton Family Of Doctors (NPI 1588997233, Austin, TX); The University Of Texas At Austin (NPI 1073032546, Austin, TX); University Of Texas At Austin Dell Medical School (NPI 1073066239, Austin, TX); Central Texas Community Health Centers (NPI 1427882091, Austin, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Washington University School Of Medicine, class of 2004
## Record status
- **NPPES last updated:** March 16, 2017
- **Other identifiers:** Medicaid 356696001 (TX); Medicare PIN 476659YMGJ (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1912199563) · Data from the CMS NPPES public registry.