MARIANA L.G. COOK-HUYNH MD
NPI 1821356247
Family Medicine in Tamuning, GU
About Mariana L.g. Cook-huynh Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIANA L.G. COOK-HUYNH MD (NPI 1821356247) is an individual family medicine provider in Tamuning, Guam, licensed in Guam (M1970) and active in the NPI registry since April 2012. She is enrolled in Medicare PECOS and is a graduate of Mayo Medical School (2012).
NPPES Registry Identity
Specialties & Licenses 2
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
Mariana L.g. Cook-huynh 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
4Medicare enrollment records show Mariana Cook-huynh reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tamuning, GU 96913
- Reassigned Medicare billing, Guam enrollment
- 11 clinicians in this Medicare group
Tamuning, GU 96913
- Reassigned Medicare billing, Guam enrollment
- 2 clinicians in this Medicare group
Dededo, GU 96929
- Reassigned Medicare billing, Guam enrollment
- 432 clinicians in this Medicare group
Oka Tamuning, GU 96913
- Reassigned Medicare billing, Guam enrollment
- 320 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 96913 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
TAMUNING, GU 96913
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 Mariana Cook-huynh's NPI number?
The NPI number for Mariana Cook-huynh is 1821356247. It was assigned to this individual provider in the NPPES registry on April 24, 2012.
Where is Mariana Cook-huynh located?
Mariana Cook-huynh practices at 744 N Marine Corps Dr Ste 121, Tamuning, GU 96913. The listed phone number is (671) 588-2394.
What is Mariana Cook-huynh's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mariana Cook-huynh enrolled in Medicare?
Yes. Mariana Cook-huynh 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 Mariana Cook-huynh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mariana Cook-huynh reassigns Medicare benefits to 4 organizations: (Tamuning, GU), Famalaoan Wellness Center (Tamuning, GU), Guam Healthcare Development Incorporated (Dededo, GU) and Guam Memorial Hospital (Oka Tamuning, GU). 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 Mariana Cook-huynh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mariana Cook-huynh was last updated on October 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Mariana L.g. Cook-Huynh, MD · NPI 1821356247
Family Medicine physician in Tamuning, GU. Individual provider, active in the CMS NPPES registry since April 24, 2012.
## Identity
- **NPI:** 1821356247 (Entity type: Individual)
- **Enumerated:** April 24, 2012
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** M1970 (GU)
- **Sole proprietor:** No
## Practice location
- **Address:** 744 N MARINE CORPS DR STE 121, Tamuning, GU 96913-4426
- **Phone:** (671) 588-2394
## 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): (NPI 1518182187, Tamuning, GU); Famalaoan Wellness Center (NPI 1881413771, Tamuning, GU); Guam Healthcare Development Incorporated (NPI 1326447939, Dededo, GU); Guam Memorial Hospital (NPI 1366519027, Oka Tamuning, GU) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Mayo Medical School, class of 2012
## Record status
- **NPPES last updated:** October 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1821356247) · Data from the CMS NPPES public registry.