Pyogenic (bacterial) infection localized to an intervertebral disc in the cervical spine region, classified under other inflammatory spondylopathies.

Documentation tips

What should appear in the chart to support M46.32.

Source · Editorial brief grounded in 5 cited references ↓

• Specify 'cervical region' explicitly in the assessment — if the note only says 'spine' or 'neck,' a coder cannot differentiate C2–C7 from the occipito-atlanto-axial or cervicothoracic levels.
• Record the causative organism name and source (blood culture, disc aspiration, intraoperative culture) so the B95–B97 code can be assigned accurately; 'gram-positive organism' alone is insufficient.
• Document whether adjacent vertebral bodies are involved — concurrent vertebral osteomyelitis (M46.22) should be coded alongside M46.32 when radiologic or surgical findings confirm it.
• Note MRI findings: disc space narrowing, endplate erosion, T2 signal hyperintensity, and any epidural or paraspinal abscess extension — these support medical necessity and influence DRG CC/MCC assignment.
• Capture the patient's immunocompromising conditions, IV drug use history, or prior instrumentation, which establish clinical plausibility and support higher-acuity E/M or surgical coding.

Related CPT procedures

Procedure codes commonly billed with M46.32. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M46.32 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Omitting the B95–B97 organism code: the parent code M46.3 carries a 'Use additional code' instruction; billing M46.32 alone is technically incomplete and can trigger claim edits.
• Using M46.32 for tuberculous or fungal disc infections — pyogenic means bacterial only; Pott's disease routes to A18.01 and fungal discitis to appropriate B-chapter codes.
• Defaulting to M46.30 (site unspecified) when the imaging report clearly identifies cervical involvement — unspecified codes invite downcoding queries and audit flags.
• Confusing M46.31 (occipito-atlanto-axial region) with M46.32 (cervical) for upper cervical infections at C1–C2; the occipito-atlanto-axial level has its own distinct code.
• Failing to code concurrent epidural abscess (G06.1) separately when imaging confirms it — this is a distinct, additional diagnosis that affects severity, DRG tier, and medical necessity for decompression.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Sibling codes

Other billable codes under M46.3 (laterality / anatomic variants).