DR. GUY AARON YOUNG M.D.
NPI 1629175195
Pediatrics - Pediatric Hematology-Oncology in Los Angeles, CA
About Dr. Guy Aaron Young M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GUY AARON YOUNG M.D. (NPI 1629175195) is an individual pediatric hematology-oncology provider in Los Angeles, California, licensed in Montana (MED-PHYS-LIC-126509) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Bozeman, and is a graduate of Other (1992).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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. Guy Aaron Young 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
2Medicare enrollment records show Guy Young reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 clinicians in this Medicare group
Bozeman, MT 59715
- Reassigned Medicare billing, Montana enrollment
- 402 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.
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.
LOS ANGELES, CA 90027
LOS ANGELES, CA 90027
LOS ANGELES, CA 90027
LOS ANGELES, CA 90027
LOS ANGELES, CA 90027
LOS ANGELES, CA 90027
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 Guy Young's NPI number?
The NPI number for Guy Young is 1629175195. It was assigned to this individual provider in the NPPES registry on September 19, 2006.
Where is Guy Young located?
Guy Young practices at 4650 W Sunset Blvd, Los Angeles, CA 90027. The listed phone number is (323) 361-5507.
What is Guy Young's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.
Is Guy Young enrolled in Medicare?
Yes. Guy Young 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 Guy Young's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guy Young reassigns Medicare benefits to 2 organizations: Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA) and Bozeman Health Deaconess Hospital (Bozeman, MT). 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 Guy Young's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Guy Young accept?
Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP and Providence Health Plan list Guy Young 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 Guy Young was last updated on April 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Guy Aaron Young, M.D. · NPI 1629175195
Pediatric Hematology-Oncology physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since September 19, 2006.
## Identity
- **NPI:** 1629175195 (Entity type: Individual)
- **Enumerated:** September 19, 2006
- **Primary specialty:** Pediatrics - Pediatric Hematology-Oncology · taxonomy 2080P0207X
- **State license:** MED-PHYS-LIC-126509 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 4650 W SUNSET BLVD, Los Angeles, CA 90027-6062
- **Phone:** (323) 361-5507 · **Fax:** (323) 361-7128
## 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): Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA); Bozeman Health Deaconess Hospital (NPI 1437529112, Bozeman, MT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1992
## Record status
- **NPPES last updated:** April 14, 2026
- **Other identifiers:** Medicaid 00G851880 (CA); Medicaid GR0053510 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1629175195) · Data from the CMS NPPES public registry.