Cervical disc disorder with radiculopathy localized to the cervicothoracic region (C7-T1), where disc pathology compresses or irritates the C8 nerve root, producing radiating neurological symptoms into the arm and hand.
Verified May 8, 2026 · 6 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 6
- Region
- Spine
Documentation tips
What should appear in the chart to support M50.13.
Source · Editorial brief grounded in 6 cited references ↓
- Specify the disc level as C7-T1 or describe the region as cervicothoracic; vague 'lower cervical' language leaves the level ambiguous and may force a drop to M50.10.
- Document objective neurological findings consistent with C8 radiculopathy: ring/little finger paresthesias, intrinsic hand weakness, diminished triceps or finger flexor reflex.
- Record imaging findings (MRI or CT myelography) that confirm disc herniation or foraminal stenosis at C7-T1 — include modality, date, and relevant finding (e.g., right paracentral disc herniation with C8 nerve root compression).
- Distinguish radiculopathy from myelopathy in the clinical assessment; if both are present, code myelopathy first (M50.03) and query the provider about the primary pathology.
- Note the history of conservative treatment (physical therapy, NSAIDs, oral steroids) when supporting medical necessity for interventional procedures billed alongside this code.
Related CPT procedures
Procedure codes commonly billed with M50.13. 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 M50.13 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Coding M50.13 for axial neck pain alone without documented radicular symptoms — disc degeneration at C7-T1 without radiculopathy codes to M50.33, not M50.13.
- Assigning M50.13 when the affected level is C5-C6 or C6-C7 — those mid-cervical levels belong under M50.122 or M50.123; M50.13 is exclusive to C7-T1.
- Confusing radiculopathy with myelopathy: spinal cord signal change, gait disturbance, or hyperreflexia drives a switch to M50.03, not M50.13.
- Using an unspecified parent code (M50.10) when the provider has clearly documented C7-T1 or C8 involvement — specificity is available and required when documented.
- Appending a 7th-character extension to M50.13 — M-codes in Chapter 13 do not use encounter-type extensions (A/D/S); those apply only to injury codes.
Clinical context
Source · Editorial summary grounded in 6 cited references ↓
M50.13 is the correct code when disc pathology at the C7-T1 level produces radiculopathy — specifically C8 nerve root irritation or compression. The applicable-to notes in the ICD-10-CM Tabular List confirm this: M50.13 covers C7-T1 disc disorder with radiculopathy and C8 radiculopathy due to disc disorder. If the disc level is not documented or falls outside C7-T1, this code does not apply — use M50.10 (unspecified cervical region) or the appropriate level-specific code under M50.12 for mid-cervical involvement.
Radiculopathy must be documented as the principal feature, not inferred. A patient with disc degeneration at C7-T1 and only axial neck pain codes to M50.33 (other cervical disc degeneration, cervicothoracic region), not M50.13. If disc pathology at this level causes myelopathy — spinal cord involvement — code instead to M50.03. Radiculopathy and myelopathy are mutually exclusive under the M50 subcategory structure; choose based on documented clinical findings.
The cervicothoracic region sits at the transition zone between the mobile cervical spine and the stiffer thoracic segment. C8 radiculopathy classically presents with pain and paresthesias radiating into the ring and little fingers, intrinsic hand weakness, and diminished triceps or finger flexor reflexes. Documenting these specific neurological deficits — along with MRI or CT myelography confirming C7-T1 disc herniation or foraminal stenosis — anchors the M50.13 assignment and supports medical necessity for both conservative and surgical interventions.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Includes
- C7-T1 disc disorder with radiculopathy
- C8 radiculopathy due to disc disorder
Sibling codes
Other billable codes under M50.1 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 6 cited references ↓
01What disc level does M50.13 cover?
02Can M50.13 be used for bilateral C8 radiculopathy?
03When should I use M50.03 instead of M50.13?
04Is M50.13 valid without imaging confirmation?
05What is the MS-DRG grouping for M50.13?
06Can M50.13 be the primary diagnosis for a cervical epidural steroid injection claim?
07How does M50.13 differ from M54.12 (radiculopathy, cervical region)?
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-/M50.13
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M50.13
- 04outsourcestrategies.comhttps://www.outsourcestrategies.com/blog/icd-10-coding-for-cervical-disc-disorders-displacements/
- 05mdclarity.comhttps://www.mdclarity.com/icd-codes/m50-13
- 06cms.govhttps://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=59624&ver=13
Mira AI Scribe
The Mira AI Scribe captures the disc level (C7-T1), the laterality of nerve root compression, objective neurological deficits consistent with C8 involvement (finger paresthesias, grip weakness, reflex changes), and imaging confirmation of foraminal stenosis or herniation. That specificity locks in M50.13 over the unspecified M50.10 and prevents downcoding or payer queries requesting additional documentation to support medical necessity.
See how Mira captures M50.13 documentation