RIANNON CHRISTA ATWATER MD
NPI 1952043374
Hospitalist in Denver, CO
About Riannon Christa Atwater Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RIANNON CHRISTA ATWATER MD (NPI 1952043374) is an individual hospitalist provider in Denver, Colorado, licensed in Colorado (DR.0077832) and active in the NPI registry since April 2022. She is enrolled in Medicare PECOS and is a graduate of University Of Colorado School Of Medicine, Aurora (2022).
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
Riannon Christa Atwater 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 Reassignment
Medicare enrollment records show Riannon Atwater reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Denver, CO 80204
- Reassigned Medicare billing, Colorado enrollment
- 2,259 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 80204 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DENVER, CO 80204
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 Riannon Atwater's NPI number?
The NPI number for Riannon Atwater is 1952043374. It was assigned to this individual provider in the NPPES registry on April 7, 2022.
Where is Riannon Atwater located?
Riannon Atwater practices at 777 Bannock St, Denver, CO 80204. The listed phone number is (303) 436-6000.
What is Riannon Atwater's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Riannon Atwater enrolled in Medicare?
Yes. Riannon Atwater 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 organization bills Medicare for Riannon Atwater's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Riannon Atwater reassigns Medicare benefits to Denver Health And Hospital Authority (Denver, CO). The 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 Riannon Atwater'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 Riannon Atwater was last updated on May 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Riannon Christa Atwater, MD · NPI 1952043374
Hospitalist physician in Denver, Colorado. Individual provider, active in the CMS NPPES registry since April 7, 2022.
## Identity
- **NPI:** 1952043374 (Entity type: Individual)
- **Enumerated:** April 7, 2022
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** DR.0077832 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 777 BANNOCK ST, Denver, CO 80204-4597
- **Phone:** (303) 436-6000
## 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:** Denver Health And Hospital Authority (NPI 1477569838, Denver, CO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Colorado School Of Medicine, Aurora, class of 2022
## Record status
- **NPPES last updated:** May 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1952043374) · Data from the CMS NPPES public registry.