RACHEL LYNN DUNCAN MD
NPI 1639601628
Internal Medicine in Saint Louis, MO
About Rachel Lynn Duncan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RACHEL LYNN DUNCAN MD (NPI 1639601628) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2023042765) and active in the NPI registry since March 2017. She is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and maintains a secondary practice location in Dallas.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Rachel Lynn Duncan 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 Rachel Duncan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 611 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 6
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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Barnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOBarnes-Jewish West County Hospital
Acute Care Hospitals · Creve Coeur, MOSt Lukes Hospital
Acute Care Hospitals · Chesterfield, MOProgress West Hospital
Acute Care Hospitals · O Fallon, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63131 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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63131
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 Rachel Duncan's NPI number?
The NPI number for Rachel Duncan is 1639601628. It was assigned to this individual provider in the NPPES registry on March 30, 2017.
Where is Rachel Duncan located?
Rachel Duncan practices at 3009 N Ballas Rd Ste 390C, Saint Louis, MO 63131. The listed phone number is (314) 996-5900.
What is Rachel Duncan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Rachel Duncan enrolled in Medicare?
Yes. Rachel Duncan 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 Rachel Duncan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Rachel Duncan reassigns Medicare benefits to Physician Groups Lc (Saint Louis, MO). 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 Rachel Duncan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Rachel Duncan accept?
Health plans from UnitedHealthcare list Rachel Duncan 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.
Is Rachel Duncan affiliated with any hospitals?
According to CMS data, Rachel Duncan is affiliated with Barnes Jewish Hospital, Missouri Baptist Medical Center, Barnes-Jewish West County Hospital, St Lukes Hospital and Progress West Hospital.
When was this NPI record last updated?
The NPPES record for Rachel Duncan was last updated on September 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Rachel Lynn Duncan, MD · NPI 1639601628
Internal Medicine physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since March 30, 2017.
## Identity
- **NPI:** 1639601628 (Entity type: Individual)
- **Enumerated:** March 30, 2017
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 2023042765 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 3009 N BALLAS RD STE 390C, Saint Louis, MO 63131-2322
- **Phone:** (314) 996-5900
## 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:** Physician Groups Lc (NPI 1285664268, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Texas A & M University System, Hsc, College Of Medicine, class of 2017
## Record status
- **NPPES last updated:** September 22, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1639601628) · Data from the CMS NPPES public registry.