All ICD10 Codes

M40.35

Billable
ChapterM00–M99
Ranksubcategory
Official Description

Flatback syndrome, thoracolumbar region

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).
General instructions are available for the parent sections:
View CH13 NotesView M40 Notes

Clinical Hierarchy

CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M40-M43Deforming dorsopathies (M40-M43)
M40Kyphosis and lordosis
M40.3Flatback syndrome
M40.35Flatback syndrome, thoracolumbar region

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M40.35:

categoryM40
Kyphosis and lordosis
View context instructions
chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to M40.35. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths
Flatback syndrome1 unique routes
thoracolumbar region→M40.35

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 456
Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions with MCC
DRG 457
Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions with CC
DRG 458
Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions without CC/MCC
DRG 551
Medical Back Problems with MCC
DRG 552
Medical Back Problems without MCC

Cross Reference

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