ICDcodes.org
FY2027

M45.8 — Ankylosing spondylitis sacral and sacrococcygeal region

Billable

Is M45.8 billable?

Yes — M45.8 is billable for FY2027. M45.8 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M45.8 may be submitted for encounters from October 1, 2026 through September 30, 2027.

M45.8 at a glance

CodeM45.8
DescriptionAnkylosing spondylitis sacral and sacrococcygeal region
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does M45.8 group to?

M45.8 sits in MDC 08 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 545Connective Tissue Disorders with MCCmedical
  • 546Connective Tissue Disorders with CCmedical
  • 547Connective Tissue Disorders without CC/MCCmedical

How is M45.8 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to M45.8. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Spondylitis › ankylosing › sacrococcygeal region (chronic)

Excludes1 — never code together — inherited from M45

The conditions below can never be reported together with M45.8 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • arthropathy in Reiter's disease (M02.3-)
  • juvenile (ankylosing) spondylitis (M08.1)

Excludes2 — not included here — inherited from Chapter 13

The conditions below are not part of M45.8, but a patient may have both at the same time. When documentation supports it, M45.8 and the excluded code may both be reported.

  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Excludes2 — not included here — inherited from M45

The conditions below are not part of M45.8, but a patient may have both at the same time. When documentation supports it, M45.8 and the excluded code may both be reported.

  • Behçet's disease (M35.2)

How long has M45.8 existed?

M45.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the M45 family? (10)