Alexander Chamessian, MD PHD
Alexander Chamessian, MD PHD is a Physical Medicine & Rehabilitation Physician in Creve Coeur, MO, registered under NPI 1275194839. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1044 N MASON RD DEPT ANESTHESIOLOGY, STE L30, Creve Coeur, MO 63141. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 2023022542 | MO | Physical Medicine & Rehabilitation… primary |
| 2023022542 | MO | Pain Medicine (Physical Medicine &… |
| 2023022542 | MO | Pain Medicine (Anesthesiology) Physician |
This provider holds licence 2023022542 issued in MO. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Anesthesiology
- PAC ID
- 4284960295
Medicare enrolment is recorded as approved under the provider type Practitioner - Anesthesiology. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Physical Medicine & Rehabilitation covers
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. NUCC Health Care Provider Taxonomy, code 208100000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208100000X | Physical Medicine & Rehabilitation Physician | 2023022542 | MO | primary |
| 2081P2900X | Pain Medicine (Physical Medicine & Rehabilitation) Physician Pain Medicine | 2023022542 | MO | |
| 207LP2900X | Pain Medicine (Anesthesiology) Physician Pain Medicine | 2023022542 | MO |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1275194839 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 25, 2019 |
| Last updated | Nov 21, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD PHD |
| Practice address |
1044 N MASON RD DEPT ANESTHESIOLOGY, STE L30 Creve Coeur, MO 63141 (314) 996-8631 Fax (314) 996-8742 |
| Mailing address |
PO BOX 7412011 Chicago, IL 60674 |
| Other identifiers |
200072045
(MO) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 2 | 7 | 5 | 1 | 9 | 4 | 8 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 5 | 5 | 2 | 9 | 8 | 8 | 6 |
Sum = 71 · next multiple of 10 = 80 · check digit = 9 · actual last digit = 9
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.