MATTHEW KEEN FNP-C
NPI 1689124414
Nurse Practitioner - Family in Saint Louis, MO
About Matthew Keen Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MATTHEW KEEN FNP-C (NPI 1689124414) is an individual family provider in Saint Louis, Missouri, licensed in Missouri (2016035658) and active in the NPI registry since October 2016. He is enrolled in Medicare PECOS, is affiliated with Anderson Hospital, and maintains a secondary practice location in Saint Louis.
NPPES Registry Identity
Specialties & Licenses
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
Matthew Keen Fnp-c 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
7Medicare enrollment records show Matthew Keen reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- 186 clinicians in this Medicare group
Fenton, MO 63026
- Reassigned Medicare billing, Missouri enrollment
- 697 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 26 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 169 clinicians in this Medicare group
Maryville, IL 62062
- Reassigned Medicare billing, Illinois enrollment
- 124 clinicians in this Medicare group
Staunton, IL 62088
- Reassigned Medicare billing, Illinois enrollment
- 121 clinicians in this Medicare group
Dallas, TX 75244
- Reassigned Medicare billing, Missouri enrollment
- 412 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 5
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Anderson Hospital
Acute Care Hospitals · Maryville, ILMercy Hospital South
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63128 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 10
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
SAINT LOUIS, MO 63128
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 Matthew Keen's NPI number?
The NPI number for Matthew Keen is 1689124414. It was assigned to this individual provider in the NPPES registry on October 5, 2016.
Where is Matthew Keen located?
Matthew Keen practices at 12700 Southfork Rd Ste 280, Saint Louis, MO 63128. The listed phone number is (314) 892-6565.
What is Matthew Keen's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Matthew Keen enrolled in Medicare?
Yes. Matthew Keen 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 Matthew Keen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Keen reassigns Medicare benefits to 7 organizations: Mercy Hospital South (Saint Louis, MO), Ssm Medical Group, Inc. (Fenton, MO), Mercy Clinic Pulmonology - St. Louis, LLC (Saint Louis, MO), Mercy East Ambulatory Services LLC (Chesterfield, MO), Midwest Inpatient Anderson Health, Inc (Maryville, IL) and 2 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 Matthew Keen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Matthew Keen accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 3 other insurers list Matthew Keen 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 Matthew Keen affiliated with any hospitals?
According to CMS data, Matthew Keen is affiliated with Anderson Hospital and Mercy Hospital South.
When was this NPI record last updated?
The NPPES record for Matthew Keen was last updated on June 3, 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.
# Matthew Keen, FNP-C · NPI 1689124414
Family physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since October 5, 2016.
## Identity
- **NPI:** 1689124414 (Entity type: Individual)
- **Enumerated:** October 5, 2016
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 2016035658 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 12700 SOUTHFORK RD STE 280, Saint Louis, MO 63128-3287
- **Phone:** (314) 892-6565 · **Fax:** (314) 892-4828
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Mercy Hospital South (NPI 1568481984, Saint Louis, MO); Ssm Medical Group, Inc. (NPI 1700966207, Fenton, MO); Mercy Clinic Pulmonology - St. Louis, LLC (NPI 1821137886, Saint Louis, MO); Mercy East Ambulatory Services LLC (NPI 1134673148, Chesterfield, MO); Midwest Inpatient Anderson Health, Inc (NPI 1821758608, Maryville, IL); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Texas Tech University Health Science Center School Of Medicine, class of 2016
## Record status
- **NPPES last updated:** June 3, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1689124414) · Data from the CMS NPPES public registry.