Degenerative changes affecting the intervertebral discs at the high cervical spine level, specifically the C2-C3 and C3-C4 disc spaces, classified as 'other' degeneration distinct from disc herniation or displacement.
Verified May 8, 2026 · 5 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 12
- Region
- Spine
Documentation tips
What should appear in the chart to support M50.31.
Source · Editorial brief grounded in 5 cited references ↓
- Name the specific disc level (C2-C3 or C3-C4) in the assessment or imaging interpretation — 'high cervical' alone is insufficient without level confirmation.
- Record MRI or CT findings that support degeneration: disc space narrowing, desiccation, osteophyte formation, or loss of disc height at the identified level.
- Distinguish degeneration from displacement or herniation in the clinical note; if both are present, assign separate codes (e.g., M50.21 for displacement plus M50.31 for degeneration at the same level).
- Document any neurological findings (upper extremity numbness, weakness, Spurling's test result) separately — if radiculopathy or myelopathy is confirmed, a higher-specificity M50.0x or M50.1x code takes precedence.
- Note the chronicity and prior conservative treatment history (physical therapy, medications, injections) to support medical necessity for advanced imaging or surgical consultation.
Related CPT procedures
Procedure codes commonly billed with M50.31. 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 M50.31 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Using M50.31 when only 'cervical disc degeneration' is documented without specifying C2-C3 or C3-C4 — drop to M50.30 (unspecified region) if level is not confirmed in the record.
- Assigning M50.31 instead of M50.01 or M50.11 when the primary documented diagnosis is myelopathy or radiculopathy caused by high cervical disc disease — degeneration is the etiology, but the symptomatic condition drives the principal code.
- Confusing high cervical (C2-C4, M50.31) with mid-cervical (C4-C7, M50.32x) — imaging reports must be read carefully; C4-C5 degeneration belongs under M50.321, not M50.31.
- Omitting a second code for radiculopathy or myelopathy when both conditions are separately documented and managed — M50.31 does not capture neurological complications.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
M50.31 applies when imaging or clinical documentation confirms disc degeneration at the high cervical region — defined as C2-C3 or C3-C4 — and the pathology does not meet criteria for a more specific subtype such as disc displacement (M50.21) or disc disorder with myelopathy (M50.01). The 'other' designation in the code title encompasses degeneration that is neither herniation nor classified under myelopathy or radiculopathy subcategories. If radiculopathy or myelopathy is the dominant documented finding, step up to the appropriate M50.0x or M50.1x code instead.
Within the M50.3x family, region specificity is mandatory for accurate coding. M50.30 is the unspecified fallback when the operative or imaging report does not name a specific cervical level — use M50.31 only when C2-C3 or C3-C4 is explicitly documented. Mid-cervical degeneration (C4-C5 through C6-C7) belongs under M50.32x, and cervicothoracic (C7-T1) under M50.33. Assigning M50.31 without level-specific imaging documentation creates an audit vulnerability.
High cervical disc degeneration at C2-C3 and C3-C4 is less common than mid-cervical degeneration and can produce occipital neuralgia, upper neck stiffness, and referred pain patterns distinct from lower cervical levels. When the patient also has radiculopathy or myelopathy that is separately documented, code both conditions — M50.31 as the degeneration code plus the appropriate M50.0x or M50.1x — if both are independently managed and documented.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Includes
- Other C2-C3 cervical disc degeneration
- Other C3-C4 cervical disc degeneration
Sibling codes
Other billable codes under M50.3 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01What disc levels does M50.31 cover?
02When should I use M50.30 instead of M50.31?
03Can M50.31 be used alongside a radiculopathy code?
04Does M50.31 require a 7th-character extension?
05Is M50.31 valid for physical therapy and chiropractic billing?
06How does M50.31 differ from M50.21 (high cervical disc displacement)?
07What imaging findings support M50.31?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 (effective Oct 1, 2025)
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M50-M54/M50-/M50.31
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M50.31
- 04icdcodes.aihttps://icdcodes.ai/diagnosis/degeneration-of-cervical-intervertebral-disc/
- 05outsourcestrategies.comhttps://www.outsourcestrategies.com/blog/icd-10-coding-for-cervical-disc-disorders-displacements/
Mira AI Scribe
The Mira AI Scribe captures the specific disc level (C2-C3 or C3-C4), imaging modality and findings (MRI disc desiccation, height loss, osteophytes), neurological exam results (Spurling's test, dermatomal sensory changes), and prior conservative treatment history. This prevents the coder from defaulting to M50.30 (unspecified region) and supports medical necessity when ordering advanced imaging or proceeding to surgical planning.
See how Mira captures M50.31 documentation