M46.53 classifies infectious spondylopathy affecting the cervicothoracic region (C7–T1 junction) that does not fall under a more specific infective spinal diagnosis such as tuberculous spondylitis (M45) or pyogenic vertebral osteomyelitis coded elsewhere.
Verified May 8, 2026 · 4 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 10
- Region
- Spine
Documentation tips
What should appear in the chart to support M46.53.
Source · Editorial brief grounded in 4 cited references ↓
- Explicitly name the region as 'cervicothoracic' or reference the C7–T1 level in the clinical note — generic 'cervical spine infection' defaults to M46.52 (cervical region).
- Assign a secondary organism code (e.g., from B95–B97 for bacteria/viruses or B35–B49 for fungi) when the causative pathogen is identified via culture, biopsy, or serology.
- Record MRI findings (endplate erosion, disc signal change, paraspinal or epidural abscess) and lab values (ESR, CRP, WBC, blood cultures) that substantiate the infectious etiology.
- Document the clinical basis for choosing 'other infective' rather than a more specific category — note absence of tuberculosis, brucellosis, or pyogenic osteomyelitis if those were ruled out.
- If the infection involves multiple spinal levels spanning cervicothoracic and adjacent regions, evaluate whether M46.59 (multiple sites) is more accurate than a single-region code.
Related CPT procedures
Procedure codes commonly billed with M46.53. 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 M46.53 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Billing M46.5 (the non-billable parent) instead of the sixth-character regional code M46.53 — payers will reject the claim or return it for greater specificity.
- Using M46.53 for degenerative or inflammatory spondylopathies without documented infectious etiology; non-infective inflammatory conditions belong in M46.8x or M47.x.
- Defaulting to M46.52 (cervical region) when the pathology is documented at the C7–T1 junction — the cervicothoracic region has its own distinct code and must be used when that level is specified.
- Omitting the secondary organism identification code when the pathogen is known, which can trigger medical necessity questions and underdocument the clinical complexity for DRG assignment in inpatient settings.
- Confusing M46.53 with vertebral osteomyelitis codes (M46.2x series); if the infection primarily involves the vertebral body rather than the disc/spondylopathy complex, the osteomyelitis codes take precedence per clinical documentation.
Clinical context
Source · Editorial summary grounded in 4 cited references ↓
Use M46.53 when the documented diagnosis is an infective spondylopathy at the cervicothoracic junction and the causative organism or clinical picture does not map to a more specific code. The cervicothoracic region covers the C7–T1 articulation — a transitional zone prone to biomechanical stress that can complicate both the clinical presentation and the surgical approach. Organisms driving infective spondylopathies at this level include bacteria (e.g., Staphylococcus aureus in hematogenous spread), fungi, and parasites; when the pathogen is identified, ICD-10-CM instructs coders to assign an additional code to identify the organism.
M46.53 sits under parent code M46.5 (Other infective spondylopathies), which is non-billable. Do not stop at M46.5 — drill down to the sixth-character regional specificity. Adjacent codes in the M46.5 family cover every spinal region from occipito-atlanto-axial (M46.51) through multiple sites (M46.59); select M46.53 only when the clinical documentation explicitly places the infection at the cervicothoracic level.
This code surfaces in post-surgical spine infections, immunocompromised patients with hematogenous spread, and patients with IV drug use history presenting with neck-to-upper-thoracic pain and fever. Payers may require supporting imaging (MRI with contrast is the gold standard for discitis/spondylitis) and laboratory evidence of infection before approving high-acuity inpatient or procedural claims tied to this diagnosis.
Sibling codes
Other billable codes under M46.5 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 4 cited references ↓
01What is the cervicothoracic region for ICD-10 coding purposes?
02Do I need to code the organism separately with M46.53?
03How does M46.53 differ from vertebral osteomyelitis codes like M46.23?
04Is M46.53 valid for outpatient claims, or only inpatient?
05What imaging supports medical necessity for M46.53?
06Can M46.53 be used when the infection follows spine surgery?
07What are the adjacent regional codes in the M46.5 family I should know?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
Mira AI Scribe
Mira's AI scribe captures the affected spinal level (C7–T1/cervicothoracic), infectious indicators (fever, elevated CRP/ESR, positive cultures or biopsy), MRI findings (endplate changes, disc involvement, paraspinal abscess), and any identified organism — preventing a drop to the non-billable M46.5 parent or misassignment to the cervical-only M46.52, both of which trigger claim rejection or audit scrutiny.
See how Mira captures M46.53 documentation