S34.129A ICD-10-CM Code: Incomplete lesion of unspecified level of lumbar spinal cord, initial encounter

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for S34.129A 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 S34.129A itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to each code from category S34"

• A — initial encounter (this page’s code)
• D — subsequent encounter
• S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

S34.129A, S34.129D, S34.129S

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Coder workflow for S34.129A

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

Before you code S34.129A

1. Unspecified does not mean incorrect. When the record gives no greater specificity, S34.129A 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).

   ReviewS34.121A, S34.122A, S34.123A, S34.124A, S34.125A

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

2. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. This page’s code carries “A”. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

   See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

3. Confirm the injury type, the anatomical site at the most specific level documented, laterality where the family codes it, and the encounter for the 7th character. Each injury is coded separately unless the classification provides a combination code, and a superficial injury is not coded when a more severe injury of the same site is documented. Injury chapter guidelines (Guidelines I.C.19.b, I.C.19.b.1).

   Guide: 7th characters: initial, subsequent, sequela →

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 — S34.129A is appropriate when the documentation goes no further.

   ReviewS34.121A, S34.122A, S34.123A, S34.124A, S34.125A

2. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
   Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
   No → The code is invalid without its 7th character — query for the missing element.

Consider S34.129A. Then review the Code Also note, and 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).

Anatomical site

At the most specific level the record states; a site the classification separates cannot be assumed from a procedure or a measurement.

Encounter type

Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).

External cause, place and activity

For the external cause codes reported with the injury or poisoning, where documented (Guidelines I.C.20.a).

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

• Excludes2 — not part of S34.129A(6 notes)

  Coding workflow: The conditions named in this note are not included in S34.129A. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareT18.5, T19, T63.4

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

• Code Also — related condition(4 notes)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  ReviewS22.0, S32.0, S31, R29.5

  See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

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.

Indexed Clinical Terms (1)

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.

• Injury, spinal (cord), lumbar, incomplete lesion

Don’t confuse S34.129A with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of S34.129A — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• S34.129D— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a subsequent encounter moves the case to S34.129D.

  Full comparison: S34.129A vs S34.129D →

• S34.129S— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a sequela moves the case to S34.129S.

  Full comparison: S34.129A vs S34.129S →

• T20— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns and corrosions adds T20; it is not part of this code and both may be reported when both are documented.

  Full comparison: S34.129A vs T20 →

• T32— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of burns and corrosions adds T32; it is not part of this code and both may be reported when both are documented.

  Full comparison: S34.129A vs T32 →

• T18.5— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of effects of foreign body in anus and rectum adds T18.5; it is not part of this code and both may be reported when both are documented.

  Full comparison: S34.129A vs T18.5 →

• T19— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of effects of foreign body in genitourinary tract adds T19; it is not part of this code and both may be reported when both are documented.

  Full comparison: S34.129A vs T19 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
2. 4 Code Also notes — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
3. 6 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

• MCC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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 S34.129A 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 2 Code First instructions across 2 chapters: R29.5 — Transient paralysis (via S34.1.-), S32 — Fracture of lumbar spine and pelvis (via S34.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 1 Use Additional Code instruction: S38.1 — Crushing injury of abdomen, lower back, and pelvis (via S34.1.-).

These codes instruct coders to additionally report this code when it applies.

Referenced by 2 Code Also instructions: S31 — Open wound of abdomen, lower back, pelvis and external genitals (via S34.1.-), S33.1 — Subluxation and dislocation of lumbar vertebra (via S34.1.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: MCC — Major Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 377 clinically related codes on its CMS exclusion list. Does not count toward severity when the stay groups to DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).

Named in the grouper logic of 5 MS-DRGs: DRG 052 (MDC 01), DRG 053 (MDC 01), DRG 963 (MDC 24), DRG 964 (MDC 24), DRG 965 (MDC 24).

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

Clinical classification (AHRQ CCSR):INJ009 — Spinal cord injury (SCI), initial encounter (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 injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

S34.129D — Incomplete lesion of unspecified level of lumbar spinal cord, subsequent encounterCompare S34.129A vs S34.129D →, S34.129S — Incomplete lesion of unspecified level of lumbar spinal cord, sequelaCompare S34.129A vs S34.129S →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Spinal Cord Disorders/Injuries) for risk-adjusted payment.

S34.119A — Complete lesion of unspecified level of lumbar spinal cord, initial encounter, S34.119D — Complete lesion of unspecified level of lumbar spinal cord, subsequent encounter, S34.121A — Incomplete lesion of L1 level of lumbar spinal cord, initial encounter, S34.121D — Incomplete lesion of L1 level of lumbar spinal cord, subsequent encounter, S34.122A — Incomplete lesion of L2 level of lumbar spinal cord, initial encounter, S34.122D — Incomplete lesion of L2 level of lumbar spinal cord, subsequent encounter, S34.123A — Incomplete lesion of L3 level of lumbar spinal cord, initial encounter, S34.123D — Incomplete lesion of L3 level of lumbar spinal cord, subsequent encounter, S34.124A — Incomplete lesion of L4 level of lumbar spinal cord, initial encounter, S34.124D — Incomplete lesion of L4 level of lumbar spinal cord, subsequent encounter, S34.125A — Incomplete lesion of L5 level of lumbar spinal cord, initial encounter, S34.125D — Incomplete lesion of L5 level of lumbar spinal cord, subsequent encounter, S34.129D — Incomplete lesion of unspecified level of lumbar spinal cord, subsequent encounter, S34.131A — Complete lesion of sacral spinal cord, initial encounter, S34.131D — Complete lesion of sacral spinal cord, subsequent encounter, S34.132A — Incomplete lesion of sacral spinal cord, initial encounter, S34.132D — Incomplete lesion of sacral spinal cord, subsequent encounter, S34.139A — Unspecified injury to sacral spinal cord, initial encounter, S34.139D — Unspecified injury to sacral spinal cord, subsequent encounter, S34.3XXA — Injury of cauda equina, initial encounter, +230 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Quadriplegia, Paraplegia

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Spinal cord injury (SCI), initial encounter).

S34.102A — Unspecified injury to L2 level of lumbar spinal cord, initial encounter, S34.103A — Unspecified injury to L3 level of lumbar spinal cord, initial encounter, S34.104A — Unspecified injury to L4 level of lumbar spinal cord, initial encounter, S34.105A — Unspecified injury to L5 level of lumbar spinal cord, initial encounter, S34.109A — Unspecified injury to unspecified level of lumbar spinal cord, initial encounter, S34.111A — Complete lesion of L1 level of lumbar spinal cord, initial encounter, S34.112A — Complete lesion of L2 level of lumbar spinal cord, initial encounter, S34.113A — Complete lesion of L3 level of lumbar spinal cord, initial encounter, S34.114A — Complete lesion of L4 level of lumbar spinal cord, initial encounter, S34.115A — Complete lesion of L5 level of lumbar spinal cord, initial encounter, S34.119A — Complete lesion of unspecified level of lumbar spinal cord, initial encounter, S34.121A — Incomplete lesion of L1 level of lumbar spinal cord, initial encounter, S34.122A — Incomplete lesion of L2 level of lumbar spinal cord, initial encounter, S34.123A — Incomplete lesion of L3 level of lumbar spinal cord, initial encounter, S34.124A — Incomplete lesion of L4 level of lumbar spinal cord, initial encounter, S34.125A — Incomplete lesion of L5 level of lumbar spinal cord, initial encounter, S34.131A — Complete lesion of sacral spinal cord, initial encounter, S34.132A — Incomplete lesion of sacral spinal cord, initial encounter, S34.139A — Unspecified injury to sacral spinal cord, initial encounter, S34.3XXA — Injury of cauda equina, initial encounter, +84 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test

Contextual Map

Every relationship of S34.129A 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 S34.129A with these 5 related codes in Claim Check

Hierarchy

• S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S30-S39 — Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Code First instructions

• R29.5 — Transient paralysis[Code First](via S34.1.-): “any associated spinal cord injury (S14.0, S14.1-, S24.0, S24.1-, S34.0-, S34.1-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S32 — Fracture of lumbar spine and pelvis[Code First](via S34.-): “any associated spinal cord and spinal nerve injury (S34.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions

• S38.1 — Crushing injury of abdomen, lower back, and pelvis[Use Additional Code](via S34.1.-): “spinal cord injury (S34.0, S34.1-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

• S31 — Open wound of abdomen, lower back, pelvis and external genitals[Code Also](via S34.1.-): “spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S33.1 — Subluxation and dislocation of lumbar vertebra[Code Also](via S34.1.-): “spinal cord injury (S24.0, S24.1-, S34.0-, S34.1-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• INJ009 — Spinal cord injury (SCI), initial encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Risk adjustment (CMS-HCC)

• HCC 182 — Spinal Cord Disorders/Injuries [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

• MCC — Major Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (MCC). Not counted when the stay groups to DRGs 957-959 (Other O.R. Procedures for Multiple Significant Trauma); DRGs 963-965 (Other Multiple Significant Trauma).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 052 — SPINAL DISORDERS AND INJURIES WITH CC/MCC[MS-DRG]: “SPINAL DISORDERS AND INJURIES WITH CC/MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 053 — SPINAL DISORDERS AND INJURIES WITHOUT CC/MCC[MS-DRG]: “SPINAL DISORDERS AND INJURIES WITHOUT CC/MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 963 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH MCC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 964 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITH CC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 965 — OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC[MS-DRG]: “OTHER MULTIPLE SIGNIFICANT TRAUMA WITHOUT CC/MCC (MDC 24)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous System — 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. 8,892 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026
• MDC 24 — Multiple Significant Trauma[MDC crossing]: “Multiple Significant Trauma — 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. 22,957 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Injury, spinal (cord), lumbar, incomplete lesion[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• S34 — Injury of lumbar and sacral spinal cord and nerves at abdomen, lower back and pelvis level[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.121A — Incomplete lesion of L1 level of lumbar spinal cord, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.121D — Incomplete lesion of L1 level of lumbar spinal cord, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.121S — Incomplete lesion of L1 level of lumbar spinal cord, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.122 — Incomplete lesion of L2 level of lumbar spinal cord[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.122A — Incomplete lesion of L2 level of lumbar spinal cord, initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.122D — Incomplete lesion of L2 level of lumbar spinal cord, subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• S34.122S — Incomplete lesion of L2 level of lumbar spinal cord, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

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

Risk adjustment Official source data

2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release 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 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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to S34.129A in its code family, with their registry titles.

• S34.125 — Incomplete lesion of L5 level of lumbar spinal cord
• S34.125A — Incomplete lesion of L5 level of lumbar spinal cord, initial encounter
• S34.125D — Incomplete lesion of L5 level of lumbar spinal cord, subsequent encounter
• S34.125S — Incomplete lesion of L5 level of lumbar spinal cord, sequela
• S34.129 — Incomplete lesion of unspecified level of lumbar spinal cord
• S34.129D — Incomplete lesion of unspecified level of lumbar spinal cord, subsequent encounter
• S34.129S — Incomplete lesion of unspecified level of lumbar spinal cord, sequela
• S34.13 — Other and unspecified injury to sacral spinal cord
• S34.131 — Complete lesion of sacral spinal cord
• S34.131A — Complete lesion of sacral spinal cord, initial encounter

View all codes in the S34 family