M54.50: Low back pain, unspecified

The ICD-10-CM code for low back pain when the note records the complaint without a radicular pattern, a vertebrogenic mechanism or an identified structural cause.

Billable

FY2027

TABLE OF CONTENTS

Example H2

Medical scribe app interface showing a recording waveform, a list of patient notes, and a SOAP note for John Doe.

Stop looking up codes.

Scribe auto-generates them for you.

Try Commure Scribe →

At a glance

Code Family

M54.5: Low back pain.

Condition

Low back pain

Billable

Yes, valid for HIPAA-covered transactions.

HCC Mapping (v28)

None. M54.50 maps to no HCC category under CMS-HCC v28, and mapped to none under the earlier v24 model.

DRG Grouping

MS-DRG 551 or 552, medical back problems, in MDC 08 when M54.50 is the principal diagnosis, under the FY2027 MS-DRG v44 grouper. A documented major complication or comorbidity selects 551.

Family Specificity

Three billable child codes under M54.5, split on whether the note names a vertebrogenic mechanism, names another specified form of low back pain, or records nothing beyond the complaint itself.

Which M54.5 code do I assign?

The M54.5 family splits on what the note names as the character of the pain rather than on how severe the pain is. Reserve M54.50 for a documented complaint of low back pain that carries no radicular pattern, no vertebrogenic attribution and no established structural cause.

When documentation says…

Code

Low back pain, no radiation described

M54.50

Low back pain recorded without a radicular pattern, a vertebrogenic mechanism or an established structural etiology. The note must document the complaint as a clinical finding or an active diagnosis. It must also show that no structural cause has been identified, or that the etiology remains under evaluation.

Vertebrogenic low back pain

M54.51

Low back pain the provider attributes to vertebral structures. The note must document vertebrogenic pain or the vertebral mechanism the diagnosis rests on.

Other specified low back pain

M54.59

Low back pain the provider specifies in terms that are neither unspecified nor vertebrogenic. Provider documentation drives the selection within the M54.5 family.

Low back pain with sciatica, side not stated

M54.40

Lumbago with sciatica, unspecified side. Subcategory M54.5 carries an Excludes1 note for lumbago with sciatica. When sciatica is documented, assign from the M54.4- codes rather than M54.50. Record the side when the note states it.

Low back pain due to lumbar disc displacement

M51.26

Other intervertebral disc displacement, lumbar region. Lumbago due to intervertebral disc displacement is an Excludes1 against M54.5. The disc code carries the encounter and M54.50 is not added for the same condition.

Discogenic back pain only, lumbar disc degeneration

M51.360

Other intervertebral disc degeneration, lumbar region with discogenic back pain only. This code is an Excludes1 against M54.5. It replaces M54.50 once the provider correlates the degeneration to the documented pain.

Back pain attributed solely to a psychological disorder

F45.41

Pain disorder exclusively related to psychological factors. Category M54 carries an Excludes1 for this code. M54.50 is not assigned when the pain is attributed only to a psychological disorder.

Tabular notes

EXCLUDES1

Subcategory M54.5 carries Excludes1 notes for lumbago with sciatica (M54.4-), for lumbago due to intervertebral disc displacement (M51.2-), for intervertebral disc degeneration of the lumbar region with discogenic back pain only (M51.360), for intervertebral disc degeneration of the lumbosacral region with discogenic back pain only (M51.370) and for low back strain (S39.012). An Excludes1 note means the two codes are not reported together for the same condition. When one of these conditions is documented, assign that code in place of M54.50. Category M54 carries a further Excludes1 for pain disorder exclusively related to psychological factors (F45.41). When back pain is attributed solely to a psychological disorder, M54.50 is not assigned.

FY2027: EFFECTIVE 1 OCTOBER 2026

No FY2027 changes were identified for M54.50 or for the M54.5 subcategory. The three-code split of M54.50, M54.51 and M54.59 was introduced in an earlier fiscal year and is unchanged in the FY2027 update. The FY2027 codes and tabular addenda make no change at M54 or M54.5. M54.50 carries no Code first, Use additional or Code also note at any level. Chapter 13 carries a general note to use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause.

Operational & financial impact

Why specificity matters beyond the chart: risk adjustment, DRG assignment and denial exposure all follow from which code is selected.

CMS-HCC v28 (PY2024+)

None. M54.50 maps to no HCC category under CMS-HCC v28.

M54.50 also mapped to no HCC category under the earlier CMS-HCC v24 model.

M54.50 makes no contribution to a Medicare Advantage risk score. Low back pain documentation on its own does not move the risk adjustment factor.

MS-DRG v44 (FY2027)

MS-DRG 551: Medical back problems with MCC.

MS-DRG 552: Medical back problems without MCC.

As the principal diagnosis, M54.50 groups to the medical back problem MS-DRGs in MDC 08 under the FY2027 MS-DRG v44 grouper. Which of the two applies depends on whether a major complication or comorbidity is documented.

WHERE SPECIFICITY IS LOST

Where a structural diagnosis has been established and is not coded, the claim loses the specificity that supports procedure justification for imaging, physical therapy and interventional services.

Where the underlying structural diagnosis maps to an HCC, reporting M54.50 in its place forfeits that risk weight. The structural diagnosis should be documented and coded once it has been identified.

Guideline I.B.5 bars M54.50 as an additional code when the low back pain is routinely associated with a confirmed spinal diagnosis.

Medicare and commercial payers

M54.50 is a valid billable code for Medicare claims. No National Coverage Determination governs coverage on the basis of an M54.50 diagnosis alone.

Documentation checklist to support M54.50

Chart elements that support code selection and reduce specificity-driven denials.

Low back pain, or lumbago, documented as a clinical finding or an active diagnosis.

The absence of radicular symptoms, or a statement that the radiation pattern is not specified.

The absence of an identified structural etiology, or a note that the etiology is still under evaluation.

Where a structural diagnosis has been established, that diagnosis documented and coded in place of M54.50.

Documentation that separates the presentation from vertebrogenic low back pain, which is coded M54.51.

For a chronic presentation, the provider's documentation that the pain is chronic, which supports G89.29 as an additional code.

For outpatient encounters, a confirmed diagnosis only. A probable or suspected structural diagnosis is not coded in the outpatient setting, and the documented symptom is coded instead.

FAQ

Is M54.50 a billable code?

Yes. M54.50 is a valid billable code for HIPAA-covered transactions and for Medicare claims.

When should I use M54.50 instead of the lumbago with sciatica codes?

Use the M54.4- codes when the note documents sciatica alongside the low back pain. Subcategory M54.5 carries an Excludes1 note for lumbago with sciatica. The two are not reported together for the same condition.

Does M54.50 map to an HCC?

No. M54.50 maps to no HCC category under CMS-HCC v28, and it mapped to none under v24. It makes no contribution to a Medicare Advantage risk score.

Can M54.50 be used for chronic low back pain?

Yes. M54.50 covers acute and chronic low back pain when the documentation does not specify a structural etiology. When the provider documents the low back pain as chronic, also assign G89.29, Other chronic pain, under guideline Section I.C.6.b.1.(b). M54.50 does not say whether the pain is acute or chronic. Sequence G89.29 first when the encounter is for pain control or pain management. Otherwise list M54.50 first and G89.29 after it.

Should I code M54.50 when an MRI shows a disc bulge?

That depends on what the provider has documented. If the provider has correlated the imaging finding to the patient's symptoms and recorded a disc-related diagnosis, code the structural condition. If the finding is incidental and the clinical diagnosis remains nonspecific low back pain, M54.50 is appropriate.

How does sequencing differ between inpatient and outpatient?

In the outpatient setting, code to the highest degree of certainty. If the workup has identified a structural cause, code the identified condition rather than the symptom. On the inpatient side, UHDDS principal diagnosis rules apply. If an underlying condition is confirmed during the stay, that condition becomes the principal diagnosis in place of M54.50.

Can M54.50 be reported alongside a structural spinal diagnosis?

M54.50 is not reported alongside a structural spinal diagnosis when the low back pain is routinely associated with that diagnosis. Guideline I.B.5 states that signs and symptoms associated routinely with a disease process should not be assigned as additional codes. Subcategory M54.5 also carries Excludes1 notes for lumbago due to disc displacement (M51.2-) and for M51.360 and M51.370.

What changed for M54.50 in FY2027?

M54.50 is unchanged in the FY2027 update. The FY2027 codes and tabular addenda make no change at M54 or M54.5. The CDC NCHS FY2026 addenda also published no Excludes note changes, no new child codes and no tabular instruction revisions for M54.50 or for the M54.5 subcategory.

Related codes

Codes in the same family as M54.50. Only codes with a published page render as links.

Sibling codes in the M54.5 family

M54.51: Vertebrogenic low back pain.
M54.59: Other low back pain.

Additional codes to consider

Codes outside the M54.5 family considered alongside M54.50.

Companion: code alongside when documented

G89.29: Other chronic pain, when the provider documents the low back pain as chronic, under Guideline I.C.6.b.1.(b).

Consider instead

M54.40: Lumbago with sciatica, unspecified side.
M54.41: Lumbago with sciatica, right side.
M54.42: Lumbago with sciatica, left side.
M51.26: Other intervertebral disc displacement, lumbar region.
M51.360: Other intervertebral disc degeneration, lumbar region with discogenic back pain only.
M51.16: Intervertebral disc disorders with radiculopathy, lumbar region.
M47.816: Spondylosis without myelopathy or radiculopathy, lumbar region.
M48.061: Spinal stenosis, lumbar region without neurogenic claudication.
M48.062: Spinal stenosis, lumbar region with neurogenic claudication.
F45.41: Pain disorder exclusively related to psychological factors.

Sources

All claims on this page derive from government and professional-standards sources.

National Center for Health Statistics. (2026). International classification of diseases, tenth revision, clinical modification (ICD-10-CM) FY2027 files. https://www.cdc.gov/nchs/icd/icd-10-cm/files.html
Centers for Medicare & Medicaid Services and National Center for Health Statistics. (2026). ICD-10-CM official guidelines for coding and reporting FY2027. https://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2027/ICD-10-CM-October-1-2026-FY27-Guidelines.pdf
Centers for Medicare & Medicaid Services. (2025). 2026 model software/ICD-10 mappings. https://www.cms.gov/medicare/payment/medicare-advantage-rates-statistics/risk-adjustment/2026-model-software-icd-10-mappings
Centers for Medicare & Medicaid Services. (2026). MS-DRG classifications and software, version 44. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/ms-drg-classifications-and-software