Acquired, posture-driven hyperlordosis localized to the lumbosacral junction (L5–S1 region), distinguished from congenital lordosis and from lordosis caused by prior surgery.
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 M40.47.
Source · Editorial brief grounded in 5 cited references ↓
- Name the region explicitly — 'lumbosacral' rather than 'lumbar' or 'lower back' — to distinguish M40.47 from the adjacent M40.46 (lumbar) code.
- Document that the lordosis is acquired/postural, not congenital and not a result of prior spinal surgery, to satisfy the Excludes1 requirements at the M40 level.
- If an underlying condition (e.g., hip flexor contracture, neuromuscular disease) drives the deformity, name it in the assessment so it can be sequenced first per the 'Code First' instruction.
- Record imaging findings that confirm or quantify the deformity — lumbar lordosis angle on standing lateral radiograph, segmental angulation at L5–S1 — to support medical necessity for imaging and therapy CPTs.
- Note any functional limitations or conservative treatments already attempted (physical therapy, postural retraining, bracing) to support medical necessity for continued or escalated care.
Related CPT procedures
Procedure codes commonly billed with M40.47. 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 M40.47 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Assigning M40.47 when the deformity is postprocedural — postprocedural lordosis must be coded to M96.-, which is an Excludes1 exclusion at M40.
- Using M40.47 for congenital lordosis — congenital kyphosis and lordosis belongs in Q76.4, not M40.47; mixing these constitutes an Excludes1 violation.
- Defaulting to M40.46 (lumbar) when the note specifies the lumbosacral junction — the distinction is reportable and affects DRG grouping.
- Omitting the 'Code First' underlying disease when lordosis is documented as secondary to a systemic or structural condition, resulting in incomplete code sequencing.
- Confusing postural lordosis with kyphoscoliosis (M41.-) in mixed deformity cases — if scoliosis is present, M41.- takes precedence and M40.47 cannot be reported simultaneously per Excludes1.
Clinical context
Source · Editorial summary grounded in 5 cited references ↓
M40.47 applies when a provider documents postural lordosis — also termed acquired lordosis — specifically at the lumbosacral region. The deformity results from habitual posture, muscle imbalance, or compensatory mechanics rather than a structural congenital anomaly or prior surgical intervention. The 7th character convention does not apply to M40.47; the code is complete as six characters.
The parent category M40 carries a 'Code First underlying disease' instruction. If lordosis is secondary to a condition such as hip flexor contracture, obesity, or neuromuscular disease, sequence that underlying condition before M40.47. Three Excludes1 conditions must be screened out before using M40.47: congenital kyphosis/lordosis (Q76.4), kyphoscoliosis (M41.-), and postprocedural kyphosis/lordosis (M96.-). Assigning M40.47 when any of those conditions is the actual diagnosis is a coding error, not a judgment call.
Within the M40.4x postural lordosis subcategory, region specificity is required for billing. If the deformity spans both L1–L4 (lumbar, M40.46) and the lumbosacral junction, code the documented primary region. Use M40.40 (site unspecified) only when the provider's note genuinely omits location — not as a shortcut. MS-DRG v43.0 maps M40.47 to DRGs 456–458 (spinal fusion with curvature) and 551–552 (medical back problems), so region specificity directly affects DRG assignment.
Sibling codes
Other billable codes under M40.4 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01What is the difference between M40.46 and M40.47?
02Can M40.47 be used for a patient who had prior lumbar fusion?
03Does M40.47 require a 7th-character extension?
04When does the 'Code First underlying disease' instruction apply?
05Is M40.40 (site unspecified) acceptable if imaging confirms lumbosacral involvement?
06What MS-DRGs does M40.47 map to?
07Can M40.47 and M41.- be reported together for a patient with both lordosis and scoliosis?
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/M40-M43/M40-/M40.47
- 03aapc.comhttps://www.aapc.com/codes/icd-10-codes/M40.47
- 04unboundmedicine.comhttps://www.unboundmedicine.com/icd/view/ICD-10-CM/893077/1/M40_47___Postural_lordosis_lumbosacral_region
- 05CMS MS-DRG v43.0 Grouper definitions
Mira AI Scribe
Mira AI Scribe captures the provider's explicit region description (lumbosacral vs. lumbar), the postural or acquired characterization, absence of prior spinal surgery, any documented underlying condition to sequence first, and standing lateral X-ray measurements such as lumbar lordosis angle at L5–S1. That documentation prevents downcoding to M40.40 (unspecified site), avoids an Excludes1 audit flag, and preserves the correct MS-DRG assignment.
See how Mira captures M40.47 documentation