What Is the ICD-10 Code for Low Back Pain?
The ICD-10-CM codes for low back pain are M54.50 (low back pain, unspecified), M54.51 (vertebrogenic low back pain) and M54.59 (other low back pain). All three are billable. The parent code M54.5 has been a non-billable header since October 1, 2021, so it can no longer be submitted on a claim. Choose the correct code based on what the provider documented as the cause of the pain, not on which code is easiest to use.
| Code | Official description | Use it when the provider documents | Billable |
| M54.50 | Low back pain, unspecified (includes loin pain and lumbago NOS) | Low back pain with no cause or pain pattern described | Yes |
| M54.51 | Vertebrogenic low back pain (vertebral endplate pain) | Pain attributed to the vertebral endplates, usually supported by MRI findings | Yes |
| M54.59 | Other low back pain | A specified, non-vertebrogenic source with no more specific code available | Yes |
| M54.5 | Low back pain | Never. Retired as a billable code on October 1, 2021 | No |
M54.50: Low Back Pain, Unspecified
M54.50 is the correct code when the provider documents low back pain, lumbago, or loin pain without identifying a more specific type or cause. It is commonly used during the first visit when the exact cause of the pain is still unknown.
Use M54.50 when:
- The medical note says low back pain, lumbago, or LBP without giving more specific details.
- The provider is still evaluating the patient and has not identified a specific cause.
Do not use M54.50 when:
- The provider documents a more specific type of pain that fits M54.51 or M54.59.
- The pain radiates down the leg and sciatica is documented
- The diagnosis is disc displacement, lumbar strain, or discogenic pain caused by disc degeneration.
Audit tip: Track how often your low back pain claims use M54.50. If the rate is high, providers can be documenting more specific details that coders are missing or coders can be choosing the unspecified code out of habit.
M54.51: Vertebrogenic Low Back Pain
Vertebrogenic low back pain starts in the vertebral endplates which are the areas between the vertebrae and the discs. MRI scans show Modic type 1 or type 2 changes, which indicate changes in the bone marrow near these endplates. ISASS literature estimates that about 15% of patients with chronic low back pain have mainly vertebrogenic pain.
Use M54.51 when the treating provider documents vertebrogenic low back pain or vertebral endplate pain.
| Detail | What to know |
| CPT 64628 | Destroys the basivertebral nerve using heat in the first two lumbar or sacral vertebral bodies. Imaging guidance is included. |
| CPT +64629 | Covers each additional vertebral body treated. |
| Units | Manufacturer coding guides list an MUE of 1 unit for 64628 and 2 units for 64629. |
| Global period | CPT 64628 has a 10-day global period. |
| Coverage | Medicare Administrative Contractors (MACs), including Palmetto GBA and Noridian, and commercial payers have coverage policies. Requirements vary by payer. |
M54.59: Other Low Back Pain
M54.59 is used for other specified low back pain when the provider describes the type of pain but it does not fit M54.51 and no more specific code applies. In simple terms, the pain is specified but it is not vertebrogenic.
Examples of documentation that support M54.59:
- Mechanical low back pain documented as the diagnosis.
- Muscular or myofascial low back pain when no strain or injury code applies.
- Pain from a documented non-vertebral source, such as facet-related pain when no more specific code is available.
M54.59 should not be used for every type of low back pain. If the provider documents vertebrogenic pain, use M54.51.
M54.50 vs. M54.51 vs. M54.59: How to Choose
Follow these steps to select the correct code based on the provider’s documentation:
- Is there a specific diagnosis with its own code? Conditions such as disc displacement, strain, spinal stenosis, spondylosis, or discogenic pain caused by disc degeneration may require a different code. If so, code the diagnosed condition instead of M54.5-.
- Is sciatica documented along with low back pain? If yes, consider the appropriate M54.4- code for lumbago with sciatica.
- Does the provider document vertebrogenic or endplate pain? If yes, use M54.51.
- Does the provider describe a specific type of low back pain that is not vertebrogenic? If yes, consider M54.59.
- Does the documentation only say low back pain? If no more specific diagnosis is documented, use M54.50.
Coders must not assume a cause that the provider has not documented. For example, if an MRI shows endplate changes but the provider does not link those changes to the patient’s pain, query the provider for clarification instead of assigning M54.51.
Related ICD-10 Codes for Low Back Pain Conditions
When the provider documents more than low back pain, the diagnosis often belongs in a different part of the code set. So use the following list:
- Lumbago with sciatica: M54.40 (unspecified side), M54.41 (right side), M54.42 (left side).
- Sciatica without low back pain: M54.30 (unspecified side), M54.31 (right side), M54.32 (left side).
- Lumbar or lumbosacral radiculopathy: M54.16 (lumbar), M54.17 (lumbosacral).
- Disc disorder with radiculopathy: M51.16 (lumbar), M51.17 (lumbosacral).
- Disc displacement: M51.26 (lumbar), M51.27 (lumbosacral).
- Lumbar disc degeneration: M51.360 (with discogenic back pain only), M51.361 (with discogenic back pain and lower extremity pain? Check the current code description), M51.362 (with discogenic back pain and lower extremity pain), M51.369 (without discogenic back pain or lower extremity pain).
- Lumbosacral disc degeneration: M51.370, M51.371, M51.372, and M51.379. Select the code based on the documented pain pattern.
- Lumbar spinal stenosis: M48.061 (without neurogenic claudication), M48.062 (with neurogenic claudication).
- Lumbar spondylosis: M47.816 (without myelopathy or radiculopathy), M47.26 (with radiculopathy).
- Lumbar or lumbosacral spondylolisthesis: M43.16 (lumbar), M43.17 (lumbosacral).
- Lumbar spinal instability: M53.2X6.
- Back muscle spasm: M62.830.
- Lumbar strain: S39.012A (initial encounter).
- Lumbar ligament sprain: S33.5XXA (initial encounter).
- Sacroiliitis: M46.1.
- Lumbar segmental and somatic dysfunction: M99.03.
- Cauda equina syndrome: G83.4.
- Other or unspecified back pain: M54.89 (other dorsalgia), M54.9 (dorsalgia, unspecified).
Coding tips:
Sciatica and lumbago-with-sciatica codes carry laterality and injury codes (S-codes) need a 7th character for the encounter type. Unspecified-side or missing 7th characters are a common edit trigger. For work-related or injury-related low back pain, add an external cause code after the diagnosis when the documentation supports one.
Documentation Checklist for Audit-Ready Low Back Pain Claims
Location of pain
Document where the pain occurs, such as the low back, lumbar region, or lumbosacral region. This helps confirm the correct ICD-10-CM code family.
Onset, duration, and course
Record when the pain started, how long it has lasted, and whether it is acute, chronic, or recurrent. This information helps support the diagnosis, medical necessity, and the use of G89 codes when applicable.
Pain pattern and radiation
Describe how the pain feels and whether it spreads to other areas, such as the legs. This helps distinguish general low back pain from sciatica or radiculopathy.
Provider-documented cause or type:
Record the type or cause of pain when the provider identifies it, such as vertebrogenic, mechanical, or discogenic pain. This documentation helps support the selection of M54.51, M54.59, or the appropriate disc-related code.
Imaging results and provider interpretation:
Include relevant MRI, X-ray, or other imaging findings, along with the provider’s interpretation. Imaging results alone do not establish a diagnosis; the provider must document the clinical diagnosis.
Red flags and warning signs
Document whether the provider screened for concerns such as trauma, a history of cancer, infection, or neurological deficits. This supports clinical decision-making and helps identify when further evaluation or imaging may be necessary.
Conservative treatments and response
Record treatments the patient has tried, such as medication, physical therapy, or home exercises, and explain how the patient responded. This information is often needed to support the medical necessity of injections or basivertebral nerve ablation.
Functional impact
Explain how the pain affects daily activities, mobility, work, sleep, or other normal functions. This helps support the need for physical therapy, other treatments, and procedures.
Laterality and encounter type
Document the affected side when applicable and identify whether an injury visit is an initial encounter, subsequent encounter, or related to a lasting effect of an earlier injury. This information helps ensure the correct sciatica code or injury code, including the required seventh character, is assigned.
Common Low Back Pain Coding Mistakes
- Choosing M54.50 by default when the note supports M54.51 or M54.59.
- Assigning M54.51 from MRI alone when the provider has not linked the findings to the pain.
- Reporting M54.5- alongside sciatica, disc displacement, strain or discogenic disc degeneration.
- Treating chronic as a feature of M54.5- instead of adding G89.29 when appropriate.
- Using G89.4 (chronic pain syndrome) when the provider only wrote chronic pain.
- Leaving superbills and EHR pick-lists unchanged after fiscal-year updates.
How Revnex Billing Care Helps With Low Back Pain Claims
Spine, pain management, orthopedic, physical therapy, chiropractic and primary care practices see low back pain every day, which makes it a high-volume denial risk. Revnex Billing Care supports practices with medical billing and revenue cycle management, including coding review, claim scrubbing, denial management and appeals. Our team helps you audit unspecified-code rates and send targeted provider education, work denied low back pain claims and fixes the root cause.
Contact us today at +1 (307) 381-5515.