ICD-10 Code M47.26: Other Spondylosis with Radiculopathy, Lumbar Region

Key Takeaways

M47.26 is the 2026 billable ICD-10-CM code for other spondylosis with radiculopathy, lumbar region, valid from 2016 through the current fiscal year.

Use M47.26 only when lumbar radiculopathy is documented without myelopathy; when myelopathy is present, M47.16 applies instead.

Clinical notes must explicitly document radiculopathy and identify the lumbar region; a diagnosis of non-specific back pain does not support this code.

Pabau’s claims management software supports accurate ICD-10 coding workflows, reducing claim errors for musculoskeletal and spinal diagnoses.

Lumbar spondylosis is one of the most prevalent musculoskeletal diagnoses encountered in orthopedics, physical therapy, and pain management. When degenerative spinal changes compress a nerve root and produce radiculopathy, coders need a precise code that captures both the structural cause and the neurological consequence. Relying on a general back pain code leaves the claim vulnerable to denial and the record without the clinical specificity that accurate documentation requires. Practice management software with integrated ICD-10 validation helps clinics get this right at the point of documentation, before a claim is ever submitted.

This reference covers the complete coding picture for ICD-10 Code M47.26: its clinical definition, documentation requirements, the critical distinction from M47.16, common CPT pairings, and the ICD-9 crosswalk.

ICD-10 Code M47.26: Definition and Clinical Description

ICD-10 Code M47.26 describes Other spondylosis with radiculopathy, lumbar region. It sits within ICD-10-CM Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99), under the Spondylopathies block (M45-M49), and is a billable, specific code valid for reimbursement purposes in the 2026 fiscal year. According to the CDC/NCHS ICD-10-CM tool, M47.26 has been continuously billable from 2016 through 2026 with no interruptions in validity.

Spondylosis under the M47 category encompasses arthrosis and osteoarthritis of the spine, as well as degeneration of the facet joints. In plain clinical terms, the condition involves age-related or mechanical wear on spinal structures: intervertebral discs lose height and hydration, osteophytes (bone spurs) form along vertebral end plates, and facet joints develop arthritic changes. When these degenerative features narrow the intervertebral foramen sufficiently to compress a lumbar nerve root, the result is radiculopathy, which may present as radiating leg pain, dermatomal numbness, weakness, or diminished reflexes.

The word “other” in the code title distinguishes M47.26 from spondylosis with myelopathy (M47.16). Radiculopathy indicates nerve root involvement; myelopathy indicates spinal cord involvement. These are clinically and neurologically distinct conditions that require separate codes. Physical therapy documentation workflows benefit from having this distinction built into the clinical record from the initial evaluation.

Code Hierarchy and Classification

The full classification path for M47.26 is:

• Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99)
• Block M45-M49: Spondylopathies
• Category M47: Spondylosis (includes arthrosis/osteoarthritis of spine; degeneration of facet joints)
• Subcategory M47.2: Other spondylosis with radiculopathy
• Code M47.26: Other spondylosis with radiculopathy, lumbar region

The lumbar region qualifier is essential. M47.2x codes exist for multiple spinal regions: M47.22 covers the cervical region, M47.23 the cervicothoracic region, M47.24 the thoracic region, and M47.25 the thoracolumbar region. M47.26 is specific to the lumbar spine only. Using the wrong regional qualifier produces a claim that does not match the documented diagnosis site.

Diagnostic Criteria and Clinical Presentation

M47.26 is a diagnosis-level code, not a symptom code. The clinician must have assessed the patient and reached a documented diagnosis of lumbar spondylosis with radiculopathy before this code is appropriate. Coders cannot infer the diagnosis from symptom codes like M54.4 (lumbago with sciatica) alone.

Typical clinical features that support a diagnosis of lumbar spondylosis with radiculopathy include:

• Dermatomal leg pain (most commonly L4, L5, or S1 distribution) reproducible on straight-leg raise or Lasegue’s test
• Motor weakness in a myotomal pattern (e.g., foot dorsiflexion weakness suggesting L4/L5 involvement)
• Diminished deep tendon reflexes (e.g., reduced patellar reflex at L4, reduced Achilles reflex at S1)
• Sensory changes (numbness, tingling, dysesthesia) in a dermatomal distribution
• Imaging evidence of intervertebral disc degeneration, osteophyte formation, or foraminal stenosis at the lumbar level

Imaging confirmation is not strictly required to use M47.26, but a clinician’s documented clinical assessment establishing the diagnosis is mandatory. When imaging is available (MRI, CT, or plain radiographs showing foraminal narrowing or osteophytic changes at lumbar levels), it strengthens medical necessity documentation and reduces the risk of payer audit challenges. Chiropractic practice workflows that integrate clinical findings with imaging references directly within the patient record support this documentation standard effectively.

Documentation Requirements for ICD-10 Code M47.26

Accurate documentation is the single most controllable factor in ICD-10 M47.26 claim success. The CMS ICD-10-CM Official Guidelines for Coding and Reporting require that diagnoses be coded to the highest degree of specificity supported by the medical record. For M47.26, three documentation elements must be present.

According to CMS ICD-10 coding guidelines, code assignment is the professional responsibility of the coder, but the diagnosis itself must come from the treating provider. A coder may not upgrade a vague “back pain” entry to M47.26 without explicit clinician documentation of spondylosis with radiculopathy in the lumbar region. When records are ambiguous, the appropriate route is a provider query, not an assumption. Compliance requirements for physiotherapy practices reinforce this principle across treatment episodes.

Clinical notes should also capture the relationship between the spondylotic changes and the radiculopathy. A note that documents “L4-L5 foraminal stenosis secondary to osteophytic changes causing left L5 radiculopathy” is substantially stronger for audit purposes than one that simply lists M47.26 as the diagnosis code without narrative support.

Differentiating M47.26 from M47.16: Radiculopathy vs. Myelopathy

The most consequential coding decision when working with spondylosis is the radiculopathy-versus-myelopathy distinction. Getting this wrong changes both the code and the clinical picture the claim communicates to the payer.

M47.26 (Other spondylosis with radiculopathy, lumbar region) applies when spondylotic changes compress a spinal nerve root, producing symptoms that radiate along the nerve’s peripheral distribution. The spinal cord itself remains unaffected. Clinical findings are unilateral or bilateral but follow dermatomal and myotomal patterns.

M47.16 (Other spondylosis with myelopathy, lumbar region) applies when spondylotic changes compress the spinal cord (or conus medullaris at lumbar levels), causing upper motor neuron signs, bowel or bladder dysfunction, or a broader neurological deficit pattern. Myelopathy is a more severe condition with different treatment implications and urgency.

This distinction is the clinician’s responsibility, not the coder’s. A coder cannot determine radiculopathy versus myelopathy from imaging reports alone. The treating provider’s documented neurological examination and diagnostic conclusion governs code selection. Sports medicine practices that see a high volume of lumbar spine patients benefit from standardised neurological examination templates that capture these differentiating findings at every relevant encounter.

Common CPT Codes Paired with This Diagnosis

M47.26 pairs with a range of CPT codes depending on the specialty and treatment approach. The diagnosis code communicates the clinical condition; the CPT code describes what was done about it. Below are the most commonly paired procedure codes across office visits, physical therapy, and interventional pain management.

Evaluation and Management (E/M)

• 99213 / 99214 / 99215: Office or outpatient E/M visits, established patient. Level selection depends on medical decision-making complexity or time. M47.26 with documented neurological findings typically supports moderate (99214) or high complexity (99215) MDM.
• 99203 / 99204 / 99205: New patient office visits. First-time evaluation of lumbar spondylosis with radiculopathy commonly warrants 99204 or 99205 given the complexity of the neurological assessment.

Physical Therapy Procedures

• 97110: Therapeutic exercises, 15-minute unit. Commonly paired when prescribing core stabilisation or lumbar extension programs for spondylosis.
• 97012: Mechanical traction. Used for lumbar nerve root decompression in radiculopathy.
• 97530: Therapeutic activities. Applied when functional movement retraining is the treatment goal.
• 97140: Manual therapy techniques. Appropriate for joint mobilisation and soft tissue work at lumbar segments.

Interventional Pain Management

• 64483: Transforaminal epidural steroid injection, lumbar or sacral, single level. A primary interventional option for lumbar radiculopathy not responding to conservative care.
• 64484: Transforaminal epidural steroid injection, lumbar or sacral, each additional level.
• 64490 / 64491 / 64492: Paravertebral facet joint nerve block, lumbar or sacral, for facet-mediated spondylotic pain.

Practices using claims management software with ICD-to-CPT crosswalk functionality can verify medical necessity linkage between M47.26 and these procedure codes before submission, reducing denials from mismatched diagnosis-procedure pairs. The AAPC Codify ICD-10-CM lookup also provides crosswalk references useful during code verification. Always confirm payer-specific Local Coverage Determinations (LCDs) for interventional procedures, as coverage requirements for lumbar epidural injections vary significantly between Medicare and commercial payers.

ICD-9 Crosswalk and Code History

For practices maintaining historical records or working with legacy billing data, M47.26 converts approximately to ICD-9-CM code 721.3 (Lumbosacral spondylosis without myelopathy). This crosswalk is approximate, not a direct equivalency. The transition from ICD-9 to ICD-10 introduced greater anatomical specificity, and the radiculopathy distinction now embedded in M47.26 was not as precisely captured under ICD-9’s less granular structure.

Several ICD-9 codes fed into what is now captured by M47.26 and its neighboring codes. Coders working with pre-2015 records or retrospective research datasets should use ResDAC’s guidance on ICD codes in Medicare files to understand the transition methodology and avoid misclassification in longitudinal analyses.

The ICD-9 to ICD-10 transition also introduced the concept of “approximate mapping” versus “exact mapping.” For M47.26, there is no exact ICD-9 equivalent with an identical scope. Any conversion should be annotated as approximate in data documentation. Practices managing multi-year patient data in EHR systems that span both code sets should ensure their clinical documentation workflows apply clear fiscal year version markers to each coded encounter.

Related ICD-10 Codes in the M47 Family

M47.26 does not exist in isolation. Understanding the surrounding code family prevents miscoding and helps ensure the most specific applicable code is selected. For practices managing spinal conditions across multiple regions and severity levels, including osteopathy and spinal care practices, a working knowledge of adjacent M47 codes is essential.

One common error is substituting M54.4 (lumbago with sciatica) for M47.26 when the clinician has documented spondylosis as the underlying cause. M54.4 is a symptom code appropriate when the cause of sciatica has not been established. When spondylosis has been diagnosed and documented as the cause, M47.26 provides the specificity that payers and auditors require. According to the ICD List reference database, M54.4 and M47.26 serve different diagnostic contexts and should not be used interchangeably.

Similarly, M54.16 (radiculopathy, lumbar region) is appropriate when the cause of the radiculopathy has not been specified or established. Once spondylosis is documented as the cause, the more specific M47.26 takes precedence. Physiotherapy clinic workflows that rely on condition-specific intake and assessment forms help clinicians capture the spondylosis diagnosis at the point of evaluation rather than falling back to less specific codes.

Coding Errors to Avoid with M47.26

Audit and denial patterns with M47.26 cluster around a handful of recurring errors. Recognising these before submission prevents unnecessary rework and reduces appeal volume.

• Using M54.4 instead of M47.26 when spondylosis is diagnosed: M54.4 is a symptom code. When the treating provider has established spondylosis as the cause of the radiculopathy, M47.26 is required.
• Selecting M47.16 for nerve root symptoms: Myelopathy codes require documented spinal cord involvement. Leg pain, dermatomal numbness, and diminished reflexes are radiculopathy findings. Verify the clinician’s documented neurological conclusion before selecting M47.16.
• Omitting regional specificity: Coding M47.2 (the parent category) rather than M47.26 is not acceptable. The lumbar regional qualifier is required. Parent-level codes are not billable in ICD-10-CM.
• Missing the link between spondylosis and radiculopathy in documentation: Two conditions listed separately in the record (spondylosis listed in the problem list, radiculopathy mentioned in the assessment) do not automatically justify M47.26. The clinician must connect them causally.
• Claiming M47.26 for cervical findings: If the patient has cervical radiculopathy caused by spondylosis, M47.22 is the appropriate code. The lumbar code applies only to the lumbar spine.

Practices that see high volumes of spinal diagnoses benefit from regular coder training on the M47 subcategory structure and from practice management tools for physiotherapy clinics that support structured diagnosis capture at the point of care. Preventing these errors upstream is substantially more efficient than managing denials after submission.

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Conclusion

Lumbar spondylosis with radiculopathy is a high-volume diagnosis across orthopedics, physical therapy, chiropractic, and pain management. Using the wrong code, whether M54.4 for a diagnosed cause or M47.16 for a radiculopathy presentation, creates audit risk and payment delays that are entirely avoidable with accurate documentation and code selection.

Pabau’s claims management software helps musculoskeletal practices reduce errors at the coding stage, with structured workflows that connect clinical documentation directly to ICD-10 code selection. To see how Pabau handles lumbar and musculoskeletal coding workflows for your practice, book a demo.

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