Displacement of an intervertebral disc in the thoracic spine (T1–T12) that does not involve radiculopathy — classified under the 'other' displacement category of the M51.2 parent code.
Verified May 8, 2026 · 5 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 15
- Region
- Spine
Documentation tips
What should appear in the chart to support M51.24.
Source · Editorial brief grounded in 5 cited references ↓
- Specify the thoracic spinal level(s) involved (e.g., T6–T7) in the clinical note or operative report — payers increasingly expect level-specific documentation.
- Distinguish displacement from degeneration in the assessment: M51.24 requires documented disc displacement, not just degenerative disc disease; imaging (MRI or CT) noting disc herniation or protrusion at a thoracic level directly supports this code.
- Explicitly document the absence of radiculopathy if the patient presents without nerve root symptoms — this justifies M51.24 over M51.14 and prevents a medical-necessity challenge.
- Record the duration, character, and location of thoracic pain, any aggravating factors, and prior conservative care to support medical necessity for both surgical and non-surgical services.
- If radiculopathy is also present, switch to M51.14 (thoracic disc disorder with radiculopathy) rather than stacking M51.14 and M51.24 — they are mutually exclusive for the same level.
Related CPT procedures
Procedure codes commonly billed with M51.24. 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 M51.24 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Using M51.24 when radiculopathy is documented: M51.14 is the correct code when thoracic disc displacement causes nerve root symptoms — do not use both codes for the same disc level.
- Confusing the thoracic region with the thoracolumbar region: displacement at the T12–L1 junction maps to M51.25, not M51.24; verify the imaging report's level designation before coding.
- Selecting M51.34 (thoracic disc degeneration) when the note actually documents displacement or herniation — degeneration and displacement are distinct clinical entities with separate codes.
- Billing M51.24 for cervicothoracic disc pathology: cervical and cervicothoracic disc disorders are excluded from M51 via an Excludes2 note and must be coded to M50.- instead.
- Leaving the diagnosis at the non-billable parent M51.2 rather than drilling down to the billable M51.24 — M51.2 will cause a claim rejection for insufficient specificity.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
M51.24 applies when a thoracic intervertebral disc is displaced and the clinical picture does not include radiculopathy (which would require M51.14 instead). The thoracic region is defined as spinal levels T1–T12. Use this code when imaging or clinical documentation confirms disc displacement at a thoracic level and the presenting complaint is thoracic pain, midback stiffness, or related mechanical symptoms without nerve root involvement.
Distinguish M51.24 from adjacent codes in the M51 family: M51.14 captures thoracic disc displacement with radiculopathy; M51.34 captures thoracic disc degeneration (not displacement); M51.25 covers the thoracolumbar region (typically T12–L1 junction). If the displacement spans both thoracic and thoracolumbar regions, document the primary level to guide code selection. Cervical and cervicothoracic disc disorders are excluded from M51 entirely — those fall under M50.-.
M51.24 is recognized by CMS as supporting medical necessity for chiropractic services (LCD A56273, Group 4), making it a valid primary diagnosis for spinal manipulation of the thoracic region. It is also a common supporting diagnosis for orthopedic evaluation, physical therapy, and interventional pain procedures targeting the thoracic spine. No 7th-character extension is required; M-codes do not use 7th-character encounter designations.
Sibling codes
Other billable codes under M51.2 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01What is the difference between M51.24 and M51.14?
02Does M51.24 require a 7th-character extension?
03Can M51.24 be used as the primary diagnosis for chiropractic spinal manipulation claims?
04When should I use M51.25 instead of M51.24?
05Is M51.24 valid for coding thoracic disc displacement following trauma?
06Can M51.24 and M51.34 be billed together for the same thoracic level?
07What imaging finding best supports M51.24?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026 — code M51.24
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M50-M54/M51-/M51.24
- 03cms.govhttps://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=56273&ver=26 (LCD A56273 — Chiropractic Services, Group 4)
- 04cms.govhttps://www.cms.gov/medicare/coding/icd10/downloads/icd10clinicalconceptsorthopedics1.pdf (CMS ICD-10 Clinical Concepts for Orthopedics)
- 05aapc.comhttps://www.aapc.com/codes/icd-10-codes/M51.2 (AAPC Codify — M51.2 parent code)
Mira AI Scribe
Mira AI Scribe captures the thoracic spinal level(s) from imaging reports (e.g., 'T6–T7 disc protrusion on MRI'), the presence or absence of radiculopathy, and the patient's pain character and prior conservative care history. This prevents downcoding to the non-billable M51.2 parent, avoids a misfire to M51.14 when radiculopathy is absent, and supplies the level-specific documentation payers require for medical necessity review.
See how Mira captures M51.24 documentation