DR. NATHANIEL H. LOO M.D.
NPI 1861791329
Anesthesiology in Mckinney, TX
About Dr. Nathaniel H. Loo M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHANIEL H. LOO M.D. (NPI 1861791329) is an individual anesthesiology provider in Mckinney, Texas, licensed in Texas (Q3040) and active in the NPI registry since March 2011. He is enrolled in Medicare PECOS, is affiliated with Medical City Plano, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
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. Nathaniel H. Loo 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
8Medicare enrollment records show Nathaniel Loo reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mckinney, TX 75069
- Reassigned Medicare billing, Texas enrollment
- 125 clinicians in this Medicare group
Plano, TX 75024
- Reassigned Medicare billing, Texas enrollment
- 5,299 clinicians in this Medicare group
Addison, TX 75001
- Reassigned Medicare billing, Texas enrollment
- 513 clinicians in this Medicare group
Fort Worth, TX 76104
- Reassigned Medicare billing, Texas enrollment
- 509 clinicians in this Medicare group
Houston, TX 77042
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: U S Anesthesia Partners Of Texas, PA
- 3,804 clinicians in this Medicare group
Naples, FL 34119
- Reassigned Medicare billing, Florida enrollment
- 767 clinicians in this Medicare group
Woodburn, OR 97071
- Reassigned Medicare billing, Oregon enrollment
- 625 clinicians in this Medicare group
Dededo, GU 96929
- Reassigned Medicare billing, Guam enrollment
- 432 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Medical City Plano
Acute Care Hospitals · Plano, TXBaylor Scott And White Medical Center Mckinney
Acute Care Hospitals · Mc Kinney, TXOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MCKINNEY, TX 75069
MCKINNEY, TX 75069
MCKINNEY, TX 75069
MCKINNEY, TX 75069
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 Nathaniel Loo's NPI number?
The NPI number for Nathaniel Loo is 1861791329. It was assigned to this individual provider in the NPPES registry on March 23, 2011.
Where is Nathaniel Loo located?
Nathaniel Loo practices at 4510 Medical Center Dr Ste 211, Mckinney, TX 75069. The listed phone number is (469) 541-1600.
What is Nathaniel Loo's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Nathaniel Loo enrolled in Medicare?
Yes. Nathaniel Loo 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 Nathaniel Loo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Loo reassigns Medicare benefits to 8 organizations: Allen Anesthesia Associates (Mckinney, TX), University Of Texas Southwestern Medical Center At Dallas (Plano, TX), Orthomed Staffing LLC (Addison, TX), Sound Physicians Anesthesiology Of Texas PLLC (Fort Worth, TX), U. S. Anesthesia Partners Of Texas, P.A., (Houston, TX) and 3 more organizations, 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 Nathaniel Loo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathaniel Loo 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 Nathaniel Loo 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 Nathaniel Loo affiliated with any hospitals?
According to CMS data, Nathaniel Loo is affiliated with Medical City Plano and Baylor Scott And White Medical Center Mckinney.
When was this NPI record last updated?
The NPPES record for Nathaniel Loo was last updated on September 28, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Nathaniel H. Loo, M.D. · NPI 1861791329
Anesthesiology physician in Mckinney, Texas. Individual provider, active in the CMS NPPES registry since March 23, 2011.
## Identity
- **NPI:** 1861791329 (Entity type: Individual)
- **Enumerated:** March 23, 2011
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** Q3040 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 4510 MEDICAL CENTER DR STE 211, Mckinney, TX 75069-1602
- **Phone:** (469) 541-1600 · **Fax:** (469) 541-1612
## 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:** 8 organizations under Medicare reassignment (form CMS-855R): Allen Anesthesia Associates (NPI 1265469357, Mckinney, TX); University Of Texas Southwestern Medical Center At Dallas (NPI 1518984988, Plano, TX); Orthomed Staffing LLC (NPI 1225514276, Addison, TX); Sound Physicians Anesthesiology Of Texas PLLC (NPI 1295356277, Fort Worth, TX); U. S. Anesthesia Partners Of Texas, P.A., (NPI 1548208564, Houston, TX); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Baylor College Of Medicine, class of 2011
## Record status
- **NPPES last updated:** September 28, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1861791329) · Data from the CMS NPPES public registry.