Degenerative changes affecting bone and cartilage at multiple levels of the adult spine, classified under spinal osteochondrosis.
Verified May 8, 2026 · 4 sources ↓
- Status
- Billable
- Chapter
- 13
- Related CPT
- 19
- Region
- Spine
Documentation tips
What should appear in the chart to support M42.19.
Source · Editorial brief grounded in 4 cited references ↓
- Name every spinal region involved (e.g., cervical, thoracic, lumbar, sacral) — 'multiple levels' without region specificity forces a drop to M42.10.
- Record imaging findings that confirm osteochondrosis at each site: endplate sclerosis, Schmorl nodes, disk space narrowing, or osteophyte formation on plain film or MRI.
- Document the patient's age or date of birth explicitly; M42.19 is valid only for patients aged 15 and older — the code carries a built-in age edit.
- If pain management or interventional procedures are planned at specific levels, list the corresponding site-specific M42.1x codes as additional diagnoses rather than relying solely on M42.19.
- Note whether conservative care has been trialed (physical therapy, NSAIDs, bracing) to support medical necessity for advanced imaging or procedural referral.
Related CPT procedures
Procedure codes commonly billed with M42.19. 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 M42.19 and adjacent codes.
Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓
- Using M42.19 when only one spinal region is affected — if documentation supports a single site, select the site-specific M42.11–M42.18 code instead.
- Assigning M42.19 to a pediatric patient: the code carries an age edit (15–124 years); juvenile presentation maps to M42.09.
- Appending a 7th-character extension (A, D, or S) to M42.19 — M-codes do not use encounter-type extensions; adding one creates an invalid code.
- Conflating M42.19 with M42.10 (site unspecified): M42.10 is for when no site is documented at all; M42.19 requires confirmed multi-site involvement.
- Omitting secondary diagnosis codes for neurologic or pain-related complications (e.g., radiculopathy, myelopathy) that drive the visit — leaving these off understates complexity and may suppress MCC/CC DRG weight.
Clinical context
Source · Editorial summary grounded in 4 cited references ↓
M42.19 captures adult spinal osteochondrosis when the degenerative bone-and-cartilage process involves more than one distinct spinal region — for example, concurrent cervical and lumbar involvement, or thoracic plus lumbar disease documented in the same encounter. The code is age-restricted to patients 15–124 years; use M42.09 for juvenile presentation. If only one spinal region is involved, select the site-specific M42.1x code for that region (e.g., M42.16 for lumbar, M42.12 for cervical). Fall back to M42.10 only when the operative or clinical report fails to identify any specific level.
Within the M42 family, M42.19 sits alongside M42.10 (site unspecified) and the single-site M42.11–M42.18 codes. It does not require a 7th-character extension — M-codes in Chapter 13 do not use A/D/S modifiers. DRG grouping under MS-DRG v43.0 lands in 553 (bone diseases and arthropathies with MCC) or 554 (without MCC), so secondary diagnoses documenting complication severity directly affect reimbursement weight.
Spinal osteochondrosis in adults often presents as endplate degeneration (Schmorl nodes), disk space narrowing, and reactive sclerosis across contiguous or non-contiguous levels. When the record documents specific regions, list M42.19 only if two or more of the discrete site codes apply to the same patient at the same encounter. Do not use M42.19 as a shortcut when documentation supports a single-level finding — site specificity reduces audit risk and supports medical necessity for imaging and intervention.
Sibling codes
Other billable codes under M42.1 (laterality / anatomic variants).
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 4 cited references ↓
01When should I use M42.19 instead of separate site-specific M42.1x codes?
02Can M42.19 be used for a 14-year-old patient?
03Does M42.19 require a 7th-character extension?
04What DRG does M42.19 map to?
05Is M42.19 the right code if the MRI shows Schmorl nodes at L1–L4 only?
06Can M42.19 be a primary diagnosis for a spine injection claim?
07How does M42.19 differ from M42.10?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
Mira AI Scribe
Mira AI Scribe captures the specific spinal regions affected (cervical, thoracic, lumbar, etc.), the patient's age, and imaging findings such as endplate sclerosis, Schmorl nodes, or disk space narrowing at each involved level. This prevents a downcode to the nonspecific M42.10 and closes the audit gap created when 'multiple sites' is asserted without named regions in the record.
See how Mira captures M42.19 documentation