Skip to main content

Z44.129 ICD-10-CM Code: Encounter for fitting and adjustment of partial artificial leg, unspecified leg

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

Coding at a Glance

Tabular directives
1 inclusion term · 2 Excludes1 · 1 Excludes2
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 189

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 559 — AFTERCARE, MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH MCC (MDC 08)
  • MS-DRG 560 — AFTERCARE, MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITH CC (MDC 08)
  • MS-DRG 561 — AFTERCARE, MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE WITHOUT CC/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.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 409 — Amputation Status, Lower Limb/Amputation Complications

Other models: CMS-HCC V22 HCC 189

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Z44.129 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on Z44.129 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • removal or replacement of external prosthetic device

Source: inherited from Z44

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).

Source: inherited from Z44

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from Z40-Z53

Coder workflow for Z44.129

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

Before you code Z44.129

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, Z44.129 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).

    ReviewZ44.121, Z44.122

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

  2. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: unspecified). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    See the relationships section · Guide: Laterality coding →

  3. Confirm the reason for the encounter this Z code records: aftercare or a therapy encounter after the initial treatment of a disease or injury. Check whether the code may be reported as first-listed or principal — some Z codes are limited to one position — and do not report a history or status code for a condition documented as current. Z code categories and their reporting positions (Guidelines I.C.21.c.7, I.C.21.c.15).

    Guide: Aftercare vs follow-up →

  4. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with Z44.129. 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 — Z44.129 is appropriate when the documentation goes no further.

    ReviewZ44.121, Z44.122

  2. Does the documentation support a condition named in Z44.129’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.

    ReviewZ97

  3. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

Consider Z44.129. 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).
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
The reason for the encounter
Whether the code records the encounter’s purpose, a status, or a history — and whether it may be first-listed (Guidelines I.C.21.c).
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 Z44.129(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Z44.129: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareZ97

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

  • Excludes2 — not part of Z44.129(1 note)

    Coding workflow: The conditions named in this note are not included in Z44.129. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

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

Coding decision scenarios

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

Documentation: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the specific siblings in this subcategory and what each requires the record to state.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

ReviewZ44.121, Z44.122

Documentation: Both the condition Z44.129 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewZ97

Documentation: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

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.

Code Overview

Encounter for fitting and adjustment of partial artificial leg, unspecified leg is a billable ICD-10-CM diagnosis code (Z44.129).

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

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

The aftercare codes are generally found in the following categories: Z42 Encounter for plastic and reconstructive surgery following medical procedure or healed injury Z43 Encounter for attention to artificial openings Z44 Encounter for fitting and adjustment of external prosthetic device Z45 Encounter for adjustment and management of implanted device Z46 Encounter for fitting and adjustment of other devices Z47 Orthopedic aftercare Z48 Encounter for other postprocedural aftercare Z49 Encounter for care involving renal dialysis Z51 Encounter for other aftercare and medical care

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 Z44.129 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 Excludes1 notes: Z08 — Encounter for follow-up examination after completed treatment for malignant neoplasm (via Z44.-), Z09 — Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm (via Z44.-).

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

Referenced by 15 Excludes2 notes across 2 chapters: T80 — Complications following infusion, transfusion and therapeutic injection (via Z44.-), T80-T88 — Complications of surgical and medical care, not elsewhere classified (T80-T88) (via Z44.-), T81 — Complications of procedures, not elsewhere classified (via Z44.-), T82 — Complications of cardiac and vascular prosthetic devices, implants and grafts (via Z44.-), T83 — Complications of genitourinary prosthetic devices, implants and grafts (via Z44.-), T84 — Complications of internal orthopedic prosthetic devices, implants and grafts (via Z44.-), T85 — Complications of other internal prosthetic devices, implants and grafts (via Z44.-), T86 — Complications of transplanted organs and tissue (via Z44.-), T87 — Complications peculiar to reattachment and amputation (via Z44.-), T88 — Other complications of surgical and medical care, not elsewhere classified (via Z44.-), Z43 — Encounter for attention to artificial openings (via Z44.-), Z48 — Encounter for other postprocedural aftercare (via Z44.-), Z96 — Presence of other functional implants (via Z44.-), Z97 — Presence of other devices (via Z44.-), Z98 — Other postprocedural states (via Z44.-).

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.

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 3 MS-DRGs: DRG 559 (MDC 08), DRG 560 (MDC 08), DRG 561 (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):FAC009 — Implant, device or graft related 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 CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Amputation Status, Lower Limb/Amputation Complications) for risk-adjusted payment.

T87.89 — Other complications of amputation stump, T87.9 — Unspecified complications of amputation stump, Z44.101 — Encounter for fitting and adjustment of unspecified right artificial leg, Z44.102 — Encounter for fitting and adjustment of unspecified left artificial leg, Z44.109 — Encounter for fitting and adjustment of unspecified artificial leg, unspecified leg, Z44.111 — Encounter for fitting and adjustment of complete right artificial leg, Z44.112 — Encounter for fitting and adjustment of complete left artificial leg, Z44.119 — Encounter for fitting and adjustment of complete artificial leg, unspecified leg, Z44.121 — Encounter for fitting and adjustment of partial artificial right leg, Z44.122 — Encounter for fitting and adjustment of partial artificial left leg, Z89.431 — Acquired absence of right foot, Z89.432 — Acquired absence of left foot, Z89.439 — Acquired absence of unspecified foot, Z89.441 — Acquired absence of right ankle, Z89.442 — Acquired absence of left ankle, Z89.449 — Acquired absence of unspecified ankle, Z89.511 — Acquired absence of right leg below knee, Z89.512 — Acquired absence of left leg below knee, Z89.519 — Acquired absence of unspecified leg below knee, Z89.611 — Acquired absence of right leg above knee, +23 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.

Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene, Traumatic Amputations and Complications

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Implant, device or graft related encounter).

Z44.022 — Encounter for fitting and adjustment of partial artificial left arm, Z44.029 — Encounter for fitting and adjustment of partial artificial arm, unspecified arm, Z44.101 — Encounter for fitting and adjustment of unspecified right artificial leg, Z44.102 — Encounter for fitting and adjustment of unspecified left artificial leg, Z44.109 — Encounter for fitting and adjustment of unspecified artificial leg, unspecified leg, Z44.111 — Encounter for fitting and adjustment of complete right artificial leg, Z44.112 — Encounter for fitting and adjustment of complete left artificial leg, Z44.119 — Encounter for fitting and adjustment of complete artificial leg, unspecified leg, Z44.121 — Encounter for fitting and adjustment of partial artificial right leg, Z44.122 — Encounter for fitting and adjustment of partial artificial left leg, Z44.20 — Encounter for fitting and adjustment of artificial eye, unspecified, Z44.21 — Encounter for fitting and adjustment of artificial right eye, Z44.22 — Encounter for fitting and adjustment of artificial left eye, Z44.30 — Encounter for fitting and adjustment of external breast prosthesis, unspecified breast, Z44.31 — Encounter for fitting and adjustment of external right breast prosthesis, Z44.32 — Encounter for fitting and adjustment of external left breast prosthesis, Z44.8 — Encounter for fitting and adjustment of other external prosthetic devices, Z44.9 — Encounter for fitting and adjustment of unspecified external prosthetic device, Z45.010 — Encounter for checking and testing of cardiac pacemaker pulse generator [battery], Z45.018 — Encounter for adjustment and management of other part of cardiac pacemaker, +118 more

Same Index main term, other category

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

Z43.0 — Encounter for attention to tracheostomy (attention to artificial opening, tracheostomy), Z43.1 — Encounter for attention to gastrostomy (attention to artificial opening, gastrostomy), Z43.2 — Encounter for attention to ileostomy (ileostomy), Z43.3 — Encounter for attention to colostomy (attention to artificial opening, colostomy), Z43.4 — Encounter for attention to other artificial openings of digestive tract (attention to artificial opening, jejunostomy), Z43.5 — Encounter for attention to cystostomy (removal of, cystostomy catheter), Z43.6 — Encounter for attention to other artificial openings of urinary tract (attention to artificial opening, nephrostomy), Z43.7 — Encounter for attention to artificial vagina (attention to artificial opening, artificial vagina), Z43.8 — Encounter for attention to other artificial openings (attention to artificial opening, specified site NEC), Z43.9 — Encounter for attention to unspecified artificial opening (attention to artificial opening), Z45.010 — Encounter for checking and testing of cardiac pacemaker pulse generator [battery] (cardiac pulse generator), Z45.018 — Encounter for adjustment and management of other part of cardiac pacemaker (adjustment, pacemaker, cardiac), Z45.02 — Encounter for adjustment and management of automatic implantable cardiac defibrillator (adjustment, device NEC, implanted, cardiac, defibrillator), Z45.09 — Encounter for adjustment and management of other cardiac device (adjustment, device NEC, implanted, cardiac), Z45.1 — Encounter for adjustment and management of infusion pump (adjustment, device NEC, implanted, infusion pump), Z45.2 — Encounter for adjustment and management of vascular access device (catheter, vascular NEC), Z45.31 — Encounter for adjustment and management of implanted visual substitution device (fitting, device NEC, substitution, visual, implanted), Z45.320 — Encounter for adjustment and management of bone conduction device (adjustment, device NEC, implanted, hearing device, bone conduction), Z45.321 — Encounter for adjustment and management of cochlear device (adjustment, device NEC, implanted, hearing device, cochlear), Z45.328 — Encounter for adjustment and management of other implanted hearing device (adjustment, device NEC, implanted, hearing device), +162 more

Contextual Map

Every relationship of Z44.129 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 Z44.129 with these 10 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes (15)

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 409 — Amputation Status, Lower Limb/Amputation Complications [CMS-HCC]— CMS-HCC V28 · 2026

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

Nearest codes (36)

Change history

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

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
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2026), quoted by section 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

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Encounter for fitting and adjustment of partial artificial leg, unspecified leg

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z44.129 in its code family, with their registry titles.

View all codes in the Z44 family