STEFEN M. AMMON MD
NPI 1730210733
Emergency Medicine in Littleton, CO
About Stefen M. Ammon Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEFEN M. AMMON MD (NPI 1730210733) is an individual emergency medicine provider in Littleton, Colorado, licensed in Idaho (MC-0362) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2003).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
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
Stefen M. Ammon 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
10Medicare enrollment records show Stefen Ammon reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Littleton, CO 80122
- Reassigned Medicare billing, Colorado enrollment
- 468 clinicians in this Medicare group
Denver, CO 80224
- Reassigned Medicare billing, Colorado enrollment
- 352 clinicians in this Medicare group
Denver, CO 80205
- Reassigned Medicare billing, Colorado, District of Columbia, Virginia and Oklahoma enrollments
- Also billed through NPI 1164920252 (Oklahoma)
- 151 clinicians in this Medicare group
Phoenix, AZ 85034
- Reassigned Medicare billing, Arizona enrollment
- 92 clinicians in this Medicare group
Tustin, CA 92780
- Reassigned Medicare billing, California enrollment
- 78 clinicians in this Medicare group
Portland, OR 97223
- Reassigned Medicare billing, Oregon enrollment
- 36 clinicians in this Medicare group
Tacoma, WA 98402
- Reassigned Medicare billing, Washington enrollment
- 120 clinicians in this Medicare group
Tampa, FL 33634
- Reassigned Medicare billing, Florida enrollment
- 132 clinicians in this Medicare group
Upper Saddle River, NJ 07458
- Reassigned Medicare billing, New Jersey enrollment
- 48 clinicians in this Medicare group
Auburn, MA 01501
- Reassigned Medicare billing, Massachusetts enrollment
- 42 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 18
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 80122 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.
LITTLETON, CO 80122
LITTLETON, CO 80122
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 Stefen Ammon's NPI number?
The NPI number for Stefen Ammon is 1730210733. It was assigned to this individual provider in the NPPES registry on March 8, 2007.
Where is Stefen Ammon located?
Stefen Ammon practices at 7700 S Broadway Littleton Adventist Hospital, Emergency Dept., Littleton, CO 80122. The listed phone number is (303) 778-5666.
What is Stefen Ammon's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Stefen Ammon enrolled in Medicare?
Yes. Stefen Ammon 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 Stefen Ammon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stefen Ammon reassigns Medicare benefits to 10 organizations: Usacs Of Colorado, Inc (Littleton, CO), Usacs Community Emergency Services Of Colorado, Inc. (Denver, CO), True North Health Navigation LLC (Denver, CO), Dispatchhealth-Arizona (Phoenix, AZ), Dispatchhealth-Ca, PC (Tustin, CA) and 5 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 Stefen Ammon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stefen Ammon accept?
Health plans from Imperial Insurance Companies, Inc. and Select Health list Stefen Ammon 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 Stefen Ammon was last updated on May 15, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Stefen M. Ammon, MD · NPI 1730210733
Emergency Medicine physician in Littleton, Colorado. Individual provider, active in the CMS NPPES registry since March 8, 2007.
## Identity
- **NPI:** 1730210733 (Entity type: Individual)
- **Enumerated:** March 8, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** MC-0362 (Idaho)
- **Sole proprietor:** No
## Practice location
- **Address:** 7700 S BROADWAY, LITTLETON ADVENTIST HOSPITAL, EMERGENCY DEPT., Littleton, CO 80122-2602
- **Phone:** (303) 778-5666 · **Fax:** (303) 778-5787
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Usacs Of Colorado, Inc (NPI 1760415871, Littleton, CO); Usacs Community Emergency Services Of Colorado, Inc. (NPI 1811522972, Denver, CO); True North Health Navigation LLC (NPI 1740622133, Denver, CO); Dispatchhealth-Arizona (NPI 1922532944, Phoenix, AZ); Dispatchhealth-Ca, PC (NPI 1639752553, Tustin, CA); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** May 15, 2020
- **Other identifiers:** Medicaid 45607753 (CO); Other P00442365 (CO)
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Source: [NPI Profile](https://npiprofile.com/npi/1730210733) · Data from the CMS NPPES public registry.