M54.6 classifies pain localized to the thoracic spine (T1–T12 region) without an identified structural or disc-based etiology. It is a terminal code — no further subdivision exists within this subcategory.
Verified May 8, 2026 · 5 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 19
- Region
- Spine
Documentation tips
What should appear in the chart to support M54.6.
Source · Editorial brief grounded in 5 cited references ↓
- Specify anatomic localization explicitly: 'thoracic spine' or 'mid-back T1–T12' — vague 'back pain' invites downcoding to M54.9 (dorsalgia, unspecified).
- Document the absence of red flags (fever, unexplained weight loss, neurologic deficits) and summarize imaging results, including whether disc pathology was ruled out — this supports M54.6 over M51.–.
- Record pain character, aggravating and relieving factors, duration, and functional impact to establish medical necessity for associated procedures or therapy services.
- If pain is chronic (3+ months), document chronicity explicitly so a secondary G89.29 code can be defensibly added to improve clinical specificity.
- Note any prior conservative care attempts (PT, NSAIDs, activity modification) when billing for interventional procedures — payers require this history to satisfy LCD criteria.
Related CPT procedures
Procedure codes commonly billed with M54.6. 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 M54.6 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Assigning M54.6 when imaging confirms a thoracic disc disorder — that is an Excludes1 violation; use M51.– instead.
- Using M54.6 for documented psychogenic dorsalgia — another Excludes1 violation; code F45.41 exclusively in those cases.
- Defaulting to M54.6 for lower back pain or lumbar complaints — lumbar pain codes to M54.5–, not M54.6; the thoracic and lumbar regions are separately classified.
- Leaving the diagnosis at M54.6 when clinical evidence supports a more specific code such as S23.3– for acute thoracic ligament sprain following trauma.
- Billing M54.6 alongside M51.– or F45.41 for the same episode of care — the Excludes1 notes prohibit this combination.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
Use M54.6 when the clinical record documents thoracic spine pain as the primary complaint and no specific structural cause — such as an intervertebral disc disorder — has been confirmed. The two Excludes1 notes are hard stops: if imaging or clinical evaluation confirms a thoracic disc disorder, code M51.– instead; if the pain is psychogenic in origin, code F45.41 instead. Neither of those codes can be reported alongside M54.6 for the same condition.
M54.6 covers a range of thoracic pain presentations: acute or chronic, myofascial, facet-mediated (thoracic facet syndrome), or mechanical in nature without confirmed disc pathology. It maps to MS-DRG 551 (with MCC) and 552 (without MCC) in the inpatient setting. When the record supports characterizing pain chronicity, add a G89 code (e.g., G89.29 for other chronic pain) as a secondary code — payers recognize this pairing and it adds clinical specificity.
Do not default to M54.6 when a more specific etiology is established. If acute trauma with ligamentous injury is documented, S23.3– is the appropriate code. If imaging confirms disc displacement, M51.2– applies. M54.6 is appropriate for non-radicular thoracic pain that lacks a confirmed structural driver — it is not a catch-all for any mid-back complaint.
Inclusion & exclusion notes
Per the official ICD-10-CM Tabular List.
Source · CDC ICD-10-CM Official Tabular List · 2026
Excludes 1 — never code together
- pain in thoracic spine due to intervertebral disc disorder (M51.-)
Sibling codes
Other billable codes under M54 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01Is M54.6 the most specific code available for thoracic spine pain?
02Can I use M54.6 alongside M51.– when a disc disorder is also present?
03Can I add a G89 chronicity code as a secondary code with M54.6?
04What is the difference between M54.6 and M54.9?
05When should I use S23.3– instead of M54.6 for thoracic back pain?
06Does M54.6 require a modifier for bilateral involvement?
07Which MS-DRGs does M54.6 map to in the inpatient setting?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CDC ICD-10-CM Tabular List 2026
- 02icd10data.comhttps://www.icd10data.com/ICD10CM/Codes/M00-M99/M50-M54/M54-/M54.6
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M54.6
- 04tebra.comhttps://www.tebra.com/theintake/icd-code-glossary/icd-10-m54-6
- 05aapc.comhttps://www.aapc.com/codes/coding-newsletters/my-orthopedic-coding-alert/icd-10-coding-back-to-basics-this-guide-resolves-back-pain-dx-problems-165818-article
Mira AI Scribe
Mira's AI scribe captures the key fields that keep M54.6 defensible: pain location documented as thoracic spine, absence of confirmed disc pathology or psychogenic etiology, imaging summary (or notation that imaging was not performed), pain character and duration, functional limitations, and prior conservative treatment history. That documentation prevents Excludes1 violations, payer denials for unspecified back pain, and audit flags for missing medical necessity support.
See how Mira captures M54.6 documentation