GUILLERMO ALBERTO MANTILLA M.D.
NPI 1326234816
Hospitalist in Carmichael, CA
About Guillermo Alberto Mantilla M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GUILLERMO ALBERTO MANTILLA M.D. (NPI 1326234816) is an individual hospitalist provider in Carmichael, California, licensed in California (C159709) and active in the NPI registry since September 2007. He is enrolled in Medicare PECOS and is a graduate of Other (1997).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Guillermo Alberto Mantilla 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
3Medicare enrollment records show Guillermo Mantilla reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carmichael, CA 95608
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Dignity Health Medical Foundation
- 1,191 clinicians in this Medicare group
Brentwood, TN 37027
- Reassigned Medicare billing, Tennessee enrollment
- 1,003 clinicians in this Medicare group
Oak Ridge, TN 37830
- Reassigned Medicare billing, Tennessee enrollment
- 1,085 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 2
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95608 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.
CARMICHAEL, CA 95608
CARMICHAEL, CA 95608
CARMICHAEL, CA 95608
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 Guillermo Mantilla's NPI number?
The NPI number for Guillermo Mantilla is 1326234816. It was assigned to this individual provider in the NPPES registry on September 19, 2007.
Where is Guillermo Mantilla located?
Guillermo Mantilla practices at 6555 Coyle Ave Ste 280, Carmichael, CA 95608. The listed phone number is (916) 536-3540.
What is Guillermo Mantilla's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Guillermo Mantilla enrolled in Medicare?
Yes. Guillermo Mantilla 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 Guillermo Mantilla's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guillermo Mantilla reassigns Medicare benefits to 3 organizations: Chw Medical Foundation (Carmichael, CA), Summit Medical Group, PLLC (Brentwood, TN) and Southeastern Physician Services PC (Oak Ridge, TN). 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 Guillermo Mantilla'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 Guillermo Mantilla was last updated on February 26, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Guillermo Alberto Mantilla, M.D. · NPI 1326234816
Hospitalist physician in Carmichael, California. Individual provider, active in the CMS NPPES registry since September 19, 2007.
## Identity
- **NPI:** 1326234816 (Entity type: Individual)
- **Enumerated:** September 19, 2007
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** C159709 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 6555 COYLE AVE STE 280, Carmichael, CA 95608-0302
- **Phone:** (916) 536-3540 · **Fax:** (916) 536-3541
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Chw Medical Foundation (NPI 1679503759, Carmichael, CA); Summit Medical Group, PLLC (NPI 1659090298, Brentwood, TN); Southeastern Physician Services PC (NPI 1083835441, Oak Ridge, TN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1997
## Record status
- **NPPES last updated:** February 26, 2019
- **Other identifiers:** Other 4352401 (TN); Medicaid 7100423880 (KY); Medicaid 1512334 (TN)
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Source: [NPI Profile](https://npiprofile.com/npi/1326234816) · Data from the CMS NPPES public registry.