DR. TIMOTHY IAN MACKENZIE MERCER MD
NPI 1215337092
Internal Medicine in Austin, TX
About Dr. Timothy Ian Mackenzie Mercer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. TIMOTHY IAN MACKENZIE MERCER MD (NPI 1215337092) is an individual internal medicine provider in Austin, Texas, licensed in Texas (R4099) and active in the NPI registry since August 2014. He is enrolled in Medicare PECOS, maintains a secondary practice location in Austin, and is a graduate of Indiana University School Of Medicine (2011).
NPPES Registry Identity
Specialties & Licenses 2
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
Dr. Timothy Ian Mackenzie Mercer 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
2Medicare enrollment records show Timothy Mercer reassigns Medicare billing to 2 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 78702
- Reassigned Medicare billing, Texas enrollment
- 79 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 78712 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 78712
AUSTIN, TX 78712
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 Timothy Mercer's NPI number?
The NPI number for Timothy Mercer is 1215337092. It was assigned to this individual provider in the NPPES registry on August 28, 2014.
Where is Timothy Mercer located?
Timothy Mercer practices at 1601 Trinity St, Austin, TX 78712. The listed phone number is (512) 978-8130.
What is Timothy Mercer's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Timothy Mercer enrolled in Medicare?
Yes. Timothy Mercer 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 Timothy Mercer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Mercer reassigns Medicare benefits to 2 organizations: Seton Family Of Doctors (Austin, TX) and Travis County Healthcare District (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 Timothy Mercer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Timothy Mercer accept?
Health plans from Blue Cross and Blue Shield of Texas, Harbor Health and Sendero Health Plans, Local Nonprofit list Timothy Mercer 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 Timothy Mercer was last updated on July 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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. Timothy Ian Mackenzie Mercer, MD · NPI 1215337092
Internal Medicine physician in Austin, Texas. Individual provider, active in the CMS NPPES registry since August 28, 2014.
## Identity
- **NPI:** 1215337092 (Entity type: Individual)
- **Enumerated:** August 28, 2014
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** R4099 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 1601 TRINITY ST, Austin, TX 78712-1765
- **Phone:** (512) 978-8130
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Seton Family Of Doctors (NPI 1588997233, Austin, TX); Travis County Healthcare District (NPI 1972271831, Austin, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2011
## Record status
- **NPPES last updated:** July 26, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1215337092) · Data from the CMS NPPES public registry.