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M45.A ICD-10-CM Code: Non-radiographic axial spondyloarthritis

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Official Registry Overview & Definition

Non-radiographic axial spondyloarthritis is a non-billable ICD-10-CM category code (M45.A). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for M45.A in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Frequently Compared Codes

The official Excludes notes on M45.A name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2022 — 2021-10-01
    Added to the code set
    Non-radiographic axial spondyloarthritis
    FY2022 changes

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of M45.A in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99) [Hierarchy]
  • M45-M49 — Spondylopathies [Hierarchy]

Referenced by Excludes1 notes

  • G55 — Nerve root and plexus compressions in diseases classified elsewhere [Excludes1](via M45.-): “nerve root compression (due to) (in) ankylosing spondylitis (M45.-)” · check together
  • M05 — Rheumatoid arthritis with rheumatoid factor [Excludes1](via M45.-): “rheumatoid arthritis of spine (M45.-)” · check together

Referenced by Code First instructions

  • J99 — Respiratory disorders in diseases classified elsewhere [Code First](via M45.-): “ankylosing spondylitis (M45.-)” · check together

Nearest codes (21)

  • M45 — Ankylosing spondylitis [Sibling]
  • M45.0 — Ankylosing spondylitis of multiple sites in spine [Sibling]
  • M45.1 — Ankylosing spondylitis of occipito-atlanto-axial region [Sibling]
  • M45.2 — Ankylosing spondylitis of cervical region [Sibling]
  • M45.3 — Ankylosing spondylitis of cervicothoracic region [Sibling]
  • M45.4 — Ankylosing spondylitis of thoracic region [Sibling]
  • M45.5 — Ankylosing spondylitis of thoracolumbar region [Sibling]
  • M45.6 — Ankylosing spondylitis lumbar region [Sibling]
  • and 13 more

Change history

  • FY2022 — Added to the code set [Change history]

Referenced by Other Codes

Official ICD-10-CM tabular notes on other codes that name M45.A or its code family.

2 Excludes1 notes across 2 chapters: G55 (via M45.-), M05 (via M45.-).

1 Code First instructions: J99 (via M45.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Can M45.A be billed directly?

No. M45.A (Non-radiographic axial spondyloarthritis) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M45.A in its code family, with their registry titles.

  • M45.5 — Ankylosing spondylitis of thoracolumbar region
  • M45.6 — Ankylosing spondylitis lumbar region
  • M45.7 — Ankylosing spondylitis of lumbosacral region
  • M45.8 — Ankylosing spondylitis sacral and sacrococcygeal region
  • M45.9 — Ankylosing spondylitis of unspecified sites in spine
  • M45.A0 — Non-radiographic axial spondyloarthritis of unspecified sites in spine
  • M45.A1 — Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region
  • M45.A2 — Non-radiographic axial spondyloarthritis of cervical region
  • M45.A3 — Non-radiographic axial spondyloarthritis of cervicothoracic region
  • M45.A4 — Non-radiographic axial spondyloarthritis of thoracic region

View all codes in the M45 family