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M54.50 ICD-10-CM Code: Low back pain, unspecified

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
2 inclusion terms · 8 Excludes1

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 551 — MEDICAL BACK PROBLEMS WITH MCC (MDC 08)
  • MS-DRG 552 — MEDICAL BACK PROBLEMS WITHOUT MCC (MDC 08)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M54.50 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on M54.50 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Loin pain
  • Lumbago NOS

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Coder workflow for M54.50

MedCoder structured workflow — derived from this code’s own official record

Before you code M54.50

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, M54.50 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    ReviewM54.51, M54.59

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with M54.50. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — M54.50 is appropriate when the documentation goes no further.

    ReviewM54.51, M54.59

  2. Does the documentation support a condition named in M54.50’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewM51.360, M51.370, S39.012, M51.2, M54.4, F45.41

Consider M54.50. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting M54.50(8 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with M54.50: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareM51.360, M51.370, S39.012, M51.2, M54.4, F45.41

    See the official tabular notes · Guidelines I.A.12.a

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Before you code M54.50

MedCoder editorial — not official ICD-10-CM text; reviewed against the cited source

This checklist routes you to the categories to review — it does not determine the final code.

M54.50 reports low back pain with no further specification — "Lumbago NOS." The M54.5 subcategory’s Excludes1 list is the routing table: a documented cause (strain, disc disease) or accompaniment (sciatica) selects a different code entirely, and two sibling rows claim specified forms. Check for these before settling on M54.50.

  • Vertebrogenic low back pain documented → M54.51 Vertebrogenic low back pain

    The documented vertebral-endplate etiology has its own sibling row — M54.50 is only for pain with no such statement.

  • Another specified form of low back pain documented → M54.59 Other low back pain

    The other-specified row claims documented forms that are neither unspecified nor vertebrogenic.

  • Sciatica documented with the low back pain → M54.4- Lumbago with sciatica

    Lumbago with sciatica is an M54.5 Excludes1 — the combination row (with laterality) replaces M54.50.

  • Low back strain documented → S39.012 Strain of muscle, fascia and tendon of lower back

    A documented strain is an injury: the Excludes1 routes it to chapter 19, where the encounter 7th character applies.

  • Pain attributed to intervertebral disc displacement → M51.2- Disc displacement

    "Lumbago due to intervertebral disc displacement" is an Excludes1 — the disc code carries the condition, not the pain code.

  • Disc degeneration documented with discogenic back pain → the M51.36-/M51.37- degeneration rows

    The Excludes1 names the discogenic-pain degeneration combinations (M51.360, M51.370) — degeneration documented as the pain source leaves M54.5- entirely.

Every routing row above is an Excludes1 — the conditions are mutually exclusive with M54.50, not additions to it. Excludes1 vs Excludes2 →

Provider documentation and the ICD-10-CM Official Guidelines control; verify against the official tabular notes on this page.

Code Overview

Low back pain, unspecified is a billable ICD-10-CM diagnosis code (M54.50).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (7)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Coding Notes

MedCoder editorial — not official ICD-10-CM text; reviewed against the cited source

What this code means

M54.50 is a symptom-level code: low back pain the provider has documented without a cause, a specified form, or sciatica. The split of M54.5 gave the subcategory three rows — unspecified (M54.50), vertebrogenic (M54.51), other (M54.59) — and stacked the real routing into the Excludes1 list: strain to the injury chapter, disc displacement and discogenic-pain degeneration to the M51 rows, sciatica to the M54.4- combination. The code’s work is honest imprecision — it says the record supports nothing more specific, which is also why a documented cause anywhere in the note outranks it.

Coding guidance

  • The Excludes1 list is the whole decision: strain (S39.012), disc displacement (M51.2-), discogenic-pain degeneration (M51.360/M51.370), and lumbago with sciatica (M54.4-) each bar M54.50 for the same condition.
  • Sciatica alone, without lumbago, has its own subcategory (M54.3-); the M54.4- rows carry the combination and its laterality.
  • A documented traumatic mechanism moves the record to chapter 19, where the encounter 7th character (A/D/S) applies — M54.50 carries no encounter axis.
  • When back pain is the reason a chronic-pain code (G89.-) is also in play, the G89 sequencing rules govern which leads — the site code and the pain-category code are companions, not rivals.

Decision-rule scenarios

Documentation: The note documents "low back pain" and nothing else.

Coding question: Is the unspecified row correct?

Rule: Yes — with no documented cause, specified form, or sciatica, M54.50 ("Lumbago NOS") is what the record supports; specificity comes from documentation, not from assumption.

Documentation: Low back pain documented with radiation down the left leg, stated as sciatica.

Coding question: Does M54.50 stand with a sciatica code beside it?

Rule: No — lumbago with sciatica is an M54.5 Excludes1: the M54.4- combination row (left side: M54.42) replaces the pair.

Documentation: The provider attributes the pain to an L4-L5 disc herniation.

Coding question: Which chapter row carries the encounter?

Rule: The disc code — "lumbago due to intervertebral disc displacement" is an Excludes1 routed to M51.2-; the pain is part of the disc condition’s code, not a separate M54.50.

Documentation: "Lifting injury at work yesterday; low back strain" documented.

Coding question: Is this still an M54 code?

Rule: No — a documented strain is an injury: S39.012 with the applicable encounter 7th character, per the Excludes1. The traumatic mechanism is the deciding element.

Scenarios state the decision rule, not a code assignment — code selection always follows the provider's documentation and the ICD-10-CM Official Guidelines.

Documentation checklist

  • Any documented cause — strain, disc displacement, degeneration with discogenic pain — each of which selects a different chapter or row.
  • Sciatica, and its side, for the M54.4- combination.
  • A vertebrogenic statement, which selects M54.51.
  • A traumatic mechanism, which moves the record to chapter 19 and its encounter characters.

Codes are assigned from provider documentation; a coder never infers a diagnosis.

Common mistakes

  • Reporting M54.50 next to a disc, strain, or sciatica code for the same pain — every one of those is an Excludes1 conflict.
  • Defaulting to M54.50 when the note documents a vertebrogenic or other specified form — the sibling rows claim those records.
  • Coding a documented acute strain as M54.50 because the visit is for pain — the injury chapter carries it, with the 7th character M54.50 lacks.
  • Using the retired parent M54.5 — since the split it is a non-billable header; claims take one of the three child rows.

Written and reviewed by MedCoder against the official ICD-10-CM files; educational, not medical or billing advice. The official tabular notes and guidelines above take precedence in every case.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name M54.50 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 4 Excludes1 notes across 3 chapters: G55 — Nerve root and plexus compressions in diseases classified elsewhere (via M54.-), M54.8 — Other dorsalgia (via M54.5.-), R52 — Pain, unspecified (via M54.5.-), R52 — Pain, unspecified (via M54.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 10 Excludes2 notes across 3 chapters: G89 — Pain, not elsewhere classified (via M54.5.-), G89 — Pain, not elsewhere classified (via M54.-), M20 — Acquired deformities of fingers and toes (via M54.-), M20-M25 — Other joint disorders (M20-M25) (via M54.-), M21 — Other acquired deformities of limbs (via M54.-), M22 — Disorder of patella (via M54.-), M23 — Internal derangement of knee (via M54.-), M24 — Other specific joint derangements (via M54.-), M25 — Other joint disorder, not elsewhere classified (via M54.-), R10 — Abdominal and pelvic pain (via M54.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 551 (MDC 08), DRG 552 (MDC 08).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MUS038 — Low back pain (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Low back pain).

M53.2X6 — Spinal instabilities, lumbar region, M53.2X7 — Spinal instabilities, lumbosacral region, M53.2X8 — Spinal instabilities, sacral and sacrococcygeal region, M53.3 — Sacrococcygeal disorders, not elsewhere classified, M53.86 — Other specified dorsopathies, lumbar region, M53.87 — Other specified dorsopathies, lumbosacral region, M53.88 — Other specified dorsopathies, sacral and sacrococcygeal region, M54.16 — Radiculopathy, lumbar region, M54.17 — Radiculopathy, lumbosacral region, M54.18 — Radiculopathy, sacral and sacrococcygeal region, M54.30 — Sciatica, unspecified side, M54.31 — Sciatica, right side, M54.32 — Sciatica, left side, M54.40 — Lumbago with sciatica, unspecified side, M54.41 — Lumbago with sciatica, right side, M54.42 — Lumbago with sciatica, left side, M54.5 — Low back pain, M54.51 — Vertebrogenic low back pain, M54.59 — Other low back pain, M62.830 — Muscle spasm of back, +21 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Pain”, “Low”, “Lumbago, lumbalgia”; these codes share that main term but sit in a different category of the Tabular List.

M25.54 — Pain in joints of hand (joint, hand), M25.55 — Pain in hip (joint, hip), M25.56 — Pain in knee (joint, knee), M25.57 — Pain in ankle and joints of foot (joint, toe), M25.59 — Pain in other specified joint (joint, specified site NEC), M26.62 — Arthralgia of temporomandibular joint (temporomandibular), M51.17 — Intervertebral disc disorders with radiculopathy, lumbosacral region (with sciatica, due to intervertebral disc disorder), M51.27 — Other intervertebral disc displacement, lumbosacral region (due to displacement, intervertebral disc), M53.1 — Cervicobrachial syndrome (cervicobrachial), M53.3 — Sacrococcygeal disorders, not elsewhere classified (coccyx), M79.18 — Myalgia, other site (myofascial), M79.60 — Pain in limb, unspecified (limb, upper), M79.609 — Pain in unspecified limb (limb), M79.62 — Pain in upper arm (axillary), M79.63 — Pain in forearm (limb, upper, forearm), M79.64 — Pain in hand and fingers (limb, upper, hand), M79.65 — Pain in thigh (limb, lower, thigh), M79.66 — Pain in lower leg (limb, lower, lower leg), M79.67 — Pain in foot and toes (limb, lower, toe), N23 — Unspecified renal colic (ureter), +102 more

Contextual Map

Every relationship of M54.50 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run M54.50 with these 10 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes (10)

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 08 — Diseases and Disorders of the Musculoskeletal System and Connective Tissue[MDC crossing]: “Diseases and Disorders of the Musculoskeletal System and Connective Tissue — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 18,508 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Low, back syndrome[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Lumbago, lumbalgia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pain (s), loin[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pain (s), low back[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pain (s), lumbar region[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pain (s), spine, low back[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Syndrome, low, back[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (39)

Change history

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary, coding notes, decision checklist and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "M54.50 — Low back pain, unspecified." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/m54.50-low-back-pain-unspecified

Change history

  • FY2022 — October 1, 2021
    Added to the code set
    Low back pain, unspecified
    FY2022 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to M54.50 in its code family, with their registry titles.

View all codes in the M54 family