DR. ALEXANDER GEORGE CHAMESSIAN MD PHD
NPI 1275194839
Physical Medicine & Rehabilitation in Creve Coeur, MO
About Dr. Alexander George Chamessian Md Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALEXANDER GEORGE CHAMESSIAN MD PHD (NPI 1275194839) is an individual physical medicine & rehabilitation provider in Creve Coeur, Missouri, licensed in Missouri (2023022542) and active in the NPI registry since June 2019. He is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and maintains a secondary practice location in Bridgeton.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 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
Dr. Alexander George Chamessian Md Phd 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
2Medicare enrollment records show Alexander Chamessian reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bridgeton, MO 63044
- Reassigned Medicare billing, Missouri enrollment
- 22 clinicians in this Medicare group
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 405 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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hospital
Acute Care Hospitals · Belleville, ILBarnes 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, MOSsm St Joseph Hospital West
Acute Care Hospitals · Lake Saint Louis, MOOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
CREVE COEUR, MO 63141
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 Alexander Chamessian's NPI number?
The NPI number for Alexander Chamessian is 1275194839. It was assigned to this individual provider in the NPPES registry on June 25, 2019.
Where is Alexander Chamessian located?
Alexander Chamessian practices at 1044 N Mason Rd Dept Anesthesiology, Ste L30, Creve Coeur, MO 63141. The listed phone number is (314) 996-8631.
What is Alexander Chamessian's specialty?
The primary specialty registered for this NPI is Physical Medicine & Rehabilitation with taxonomy code 208100000X.
Is Alexander Chamessian enrolled in Medicare?
Yes. Alexander Chamessian 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 Alexander Chamessian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Chamessian reassigns Medicare benefits to 2 organizations: Post-Acute Physicians Of Missouri PC (Bridgeton, MO) and Washington University (Saint Louis, MO). 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 Alexander Chamessian's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alexander Chamessian accept?
Health plans from Anthem Blue Cross and Blue Shield, Cox HealthPlans and Oscar Insurance Company list Alexander Chamessian 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 Alexander Chamessian affiliated with any hospitals?
According to CMS data, Alexander Chamessian is affiliated with Memorial Hospital, Barnes Jewish Hospital, Missouri Baptist Medical Center, Barnes-Jewish West County Hospital and Ssm St Joseph Hospital West.
When was this NPI record last updated?
The NPPES record for Alexander Chamessian was last updated on November 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.