DR. ALEXANDER GEORGE CHAMESSIAN MD PHD
NPI 1275194839
Physical Medicine & Rehabilitation in Creve Coeur, MO

Active since June 25, 2019PECOS EnrolledAccepts Medicare Assignment
1044 N MASON RD, DEPT ANESTHESIOLOGY, STE L30, CREVE COEUR, MO 63141(314) 996-8631(314) 996-8742 Get Directions Write a Review

NPPES record last updated: November 21, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Nov 21, 2025, Sep 18, 2024, Jul 31, 2024 and 1 more (4 updates tracked since 2024).

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 Barnes Jewish Hospital, and maintains a secondary practice location in Bridgeton.

NPPES Registry Identity

NPI1275194839
Entity TypeIndividualMale
Primary Taxonomy208100000X
Provider Legal NameDR. ALEXANDER GEORGE CHAMESSIANCredential: MD PHD
Location Address1044 N MASON RD, DEPT ANESTHESIOLOGY, STE L30Creve Coeur, MO 63141-6431
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 996-8631 · Fax (314) 996-8742
Fax(314) 996-8742
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateJune 25, 2019
Last NPPES UpdateNovember 21, 20254 updates tracked since enumeration
NPPES CertifiedNovember 21, 2025
NPI 1275194839 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

Primary SpecialtyPhysical Medicine & RehabilitationAllopathic & Osteopathic Physicians
Taxonomy Code208100000X
License Licensed in MO · 2023022542
Definition

Physical medicine and rehabilitation, also referred to as rehabilitation medicine, is the medical specialty concerned with diagnosing, evaluating, and treating patients with physical disabilities. These disabilities may arise from conditions affecting the musculoskeletal system such as neck and back pain, sports injuries, or other painful conditions affecting the limbs, such as carpal tunnel syndrome. Alternatively, the disabilities may result from neurological trauma or disease such as spinal cord injury, head injury or stroke. A physician certified in physical medicine and rehabilitation is often called a physiatrist. The primary goal of the physiatrist is to achieve maximal restoration of physical, psychological, social and vocational function through comprehensive rehabilitation. Pain management is often an important part of the role of the physiatrist. For diagnosis and evaluation, a physiatrist may include the techniques of electromyography to supplement the standard history, physical, x-ray and laboratory examinations. The physiatrist has expertise in the appropriate use of therapeutic exercise, prosthetics (artificial limbs), orthotics and mechanical and electrical devices.

Also ListedAnesthesiology · Pain MedicineTaxonomy 207LP2900X · License 2023022542 (MO)
Also ListedPhysical Medicine & Rehabilitation · Pain MedicineTaxonomy 2081P2900X · License 2023022542 (MO)
1044 N MASON RD, Creve Coeur, MO 63141

Secondary Practice Location 1

Location 112380 DePaul DriveBridgeton, MO 63044 · Phone (314) 447-9812

Other Identifiers 1

Medicaid200072045MO

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID4284960295
PECOS Enrollment IDI20240712000205
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Barnes-Jewish West County Hospital

Acute Care Hospitals · Creve Coeur, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260162
Location12634 Olive BoulevardCreve Coeur, MO 63141 · St. Louis County
Emergency services

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.

Colon & Rectal Surgery
1044 N MASON RD, DIV SURG COLON/RECTAL, STE 310
SAINT LOUIS, MO 63141
Nurse Practitioner
1044 N MASON RD, DIV IM GENERAL MED, STE 330
SAINT LOUIS, MO 63141
Physician Assistant
1044 N MASON RD, DIV IM ENDOCRINOLOGY, STE 330
SAINT LOUIS, MO 63141
Nurse Practitioner (Family)
1044 N MASON RD, DEPT ORTHOPAEDIC SURGERY, STE 110/210
SAINT LOUIS, MO 63141
Psychologist (Clinical)
1044 N MASON RD, DIV IM GERIATRIC MED, STE 330
SAINT LOUIS, MO 63141
Internal Medicine
1044 N MASON RD, DIV IM GENERAL MED, STE 330
SAINT LOUIS, MO 63141
Speech-Language Pathologist
1044 N MASON RD, DEPT OTOLARYNGOLOGY, STE L20
CREVE COEUR, MO 63141
Otolaryngology
1044 N MASON RD, DEPT OTOLARYNGOLOGY, STE L20
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.

What insurance does Alexander Chamessian accept?

Health plans from Cox HealthPlans, Medica 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 Barnes Jewish Hospital and Barnes-Jewish West County Hospital.

When was this NPI record last updated?

The NPPES record for Alexander Chamessian was last updated on November 21, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.