M84.759A ICD-10-CM Code: Complete oblique atypical femoral fracture, unspecified leg, initial encounter for fracture

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for M84.759A in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on M84.759A 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 M84.75:"

• A — initial encounter for fracture (this page’s code)
• D — subsequent encounter for fracture with routine healing
• G — subsequent encounter for fracture with delayed healing
• K — subsequent encounter for fracture with nonunion
• P — subsequent encounter for fracture with malunion
• 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

M84.759A, M84.759D, M84.759G, M84.759K, M84.759P, M84.759S

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 M84.759A

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

Before you code M84.759A

1. Unspecified does not mean incorrect. When the record gives no greater specificity, M84.759A 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).

   ReviewM84.757A, M84.758A

   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. 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).

   ReviewM84.757A · right, M84.758A · left

   Guide: Laterality coding →

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 — M84.759A is appropriate when the documentation goes no further.

   ReviewM84.757A, M84.758A

2. 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.

   ReviewM84.757A · right, M84.758A · left

3. 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 M84.759A. 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).

Encounter type

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

Open or closed; displaced or nondisplaced

Defaults apply when the record is silent: closed, and displaced (Guidelines I.C.19.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

• Excludes2 — not part of M84.759A(1 note)

  Coding workflow: The conditions named in this note are not included in M84.759A. 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

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.

• Fracture, nontraumatic, NEC, atypical, femur, complete, oblique

Don’t confuse M84.759A with…

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

The codes most likely to be picked instead of M84.759A — 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.

• M84.757A— Laterality relationship (Review)

  Same condition; these differ only in which side is documented.

  The same condition on the other side; the documented side decides, and a bilateral code, where one exists, replaces the pair when both sides are documented.

  What moves you there: A documented right side moves the case to M84.757A.

  Full comparison: M84.759A vs M84.757A →

• M84.758A— Laterality relationship (Review)

  Same condition; these differ only in which side is documented.

  The same condition on the other side; the documented side decides, and a bilateral code, where one exists, replaces the pair when both sides are documented.

  What moves you there: A documented left side moves the case to M84.758A.

  Full comparison: M84.759A vs M84.758A →

• M84.759D— 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 for fracture with routine healing moves the case to M84.759D.

  Full comparison: M84.759A vs M84.759D →

• M84.759G— 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 for fracture with delayed healing moves the case to M84.759G.

  Full comparison: M84.759A vs M84.759G →

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.

Verify Before Coding

• CC 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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

CC — 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 214 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 7 MS-DRGs: DRG 521 (MDC 08), DRG 522 (MDC 08), DRG 542 (MDC 08), DRG 543 (MDC 08), DRG 544 (MDC 08), DRG 791 (MDC 15), DRG 793 (MDC 15).

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

Clinical classification (AHRQ CCSR):MUS018 — Atypical fracture, 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 clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

M84.662A — Pathological fracture in other disease, left tibia, initial encounter for fracture, M84.663A — Pathological fracture in other disease, right fibula, initial encounter for fracture, M84.664A — Pathological fracture in other disease, left fibula, initial encounter for fracture, M84.669A — Pathological fracture in other disease, unspecified tibia and fibula, initial encounter for fracture, M84.671A — Pathological fracture in other disease, right ankle, initial encounter for fracture, M84.672A — Pathological fracture in other disease, left ankle, initial encounter for fracture, M84.673A — Pathological fracture in other disease, unspecified ankle, initial encounter for fracture, M84.674A — Pathological fracture in other disease, right foot, initial encounter for fracture, M84.675A — Pathological fracture in other disease, left foot, initial encounter for fracture, M84.676A — Pathological fracture in other disease, unspecified foot, initial encounter for fracture, M84.68XA — Pathological fracture in other disease, other site, initial encounter for fracture, M84.750A — Atypical femoral fracture, unspecified, initial encounter for fracture, M84.751A — Incomplete atypical femoral fracture, right leg, initial encounter for fracture, M84.752A — Incomplete atypical femoral fracture, left leg, initial encounter for fracture, M84.753A — Incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture, M84.754A — Complete transverse atypical femoral fracture, right leg, initial encounter for fracture, M84.755A — Complete transverse atypical femoral fracture, left leg, initial encounter for fracture, M84.756A — Complete transverse atypical femoral fracture, unspecified leg, initial encounter for fracture, M84.757A — Complete oblique atypical femoral fracture, right leg, initial encounter for fracture, M84.758A — Complete oblique atypical femoral fracture, left leg, initial encounter for fracture, +193 more

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

M84.757A — Complete oblique atypical femoral fracture, right leg, initial encounter for fracture (right)Compare M84.759A vs M84.757A →, M84.758A — Complete oblique atypical femoral fracture, left leg, initial encounter for fracture (left)Compare M84.759A vs M84.758A →

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Hip Fracture/Dislocation) for risk-adjusted payment.

M84.559A — Pathological fracture in neoplastic disease, hip, unspecified, initial encounter for fracture, M84.651A — Pathological fracture in other disease, right femur, initial encounter for fracture, M84.652A — Pathological fracture in other disease, left femur, initial encounter for fracture, M84.653A — Pathological fracture in other disease, unspecified femur, initial encounter for fracture, M84.659A — Pathological fracture in other disease, hip, unspecified, initial encounter for fracture, M84.754A — Complete transverse atypical femoral fracture, right leg, initial encounter for fracture, M84.755A — Complete transverse atypical femoral fracture, left leg, initial encounter for fracture, M84.756A — Complete transverse atypical femoral fracture, unspecified leg, initial encounter for fracture, M84.757A — Complete oblique atypical femoral fracture, right leg, initial encounter for fracture, M84.758A — Complete oblique atypical femoral fracture, left leg, initial encounter for fracture, M97.01XA — Periprosthetic fracture around internal prosthetic right hip joint, initial encounter, M97.02XA — Periprosthetic fracture around internal prosthetic left hip joint, initial encounter, S32.301A — Unspecified fracture of right ilium, initial encounter for closed fracture, S32.301B — Unspecified fracture of right ilium, initial encounter for open fracture, S32.302A — Unspecified fracture of left ilium, initial encounter for closed fracture, S32.302B — Unspecified fracture of left ilium, initial encounter for open fracture, S32.309A — Unspecified fracture of unspecified ilium, initial encounter for closed fracture, S32.309B — Unspecified fracture of unspecified ilium, initial encounter for open fracture, S32.311A — Displaced avulsion fracture of right ilium, initial encounter for closed fracture, S32.311B — Displaced avulsion fracture of right ilium, initial encounter for open fracture, +708 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Atypical fracture, initial encounter).

M84.750A — Atypical femoral fracture, unspecified, initial encounter for fracture, M84.751A — Incomplete atypical femoral fracture, right leg, initial encounter for fracture, M84.752A — Incomplete atypical femoral fracture, left leg, initial encounter for fracture, M84.753A — Incomplete atypical femoral fracture, unspecified leg, initial encounter for fracture, M84.754A — Complete transverse atypical femoral fracture, right leg, initial encounter for fracture, M84.755A — Complete transverse atypical femoral fracture, left leg, initial encounter for fracture, M84.756A — Complete transverse atypical femoral fracture, unspecified leg, initial encounter for fracture, M84.757A — Complete oblique atypical femoral fracture, right leg, initial encounter for fracture, M84.758A — Complete oblique atypical femoral fracture, left leg, initial encounter for fracture

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.

Iron Panel, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of M84.759A 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.

Hierarchy

• M00-M99 — Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) (M00-M99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M80-M85 — Disorders of bone density and structure[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• MUS018 — Atypical fracture, initial encounter[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Risk adjustment (CMS-HCC)

• HCC 402 — Hip Fracture/Dislocation [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 521 — HIP REPLACEMENT WITH PRINCIPAL DIAGNOSIS OF HIP FRACTURE WITH MCC[MS-DRG]: “HIP REPLACEMENT WITH PRINCIPAL DIAGNOSIS OF HIP FRACTURE WITH MCC (MDC 08)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 522 — HIP REPLACEMENT WITH PRINCIPAL DIAGNOSIS OF HIP FRACTURE WITHOUT MCC[MS-DRG]: “HIP REPLACEMENT WITH PRINCIPAL DIAGNOSIS OF HIP FRACTURE WITHOUT MCC (MDC 08)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 542 — PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITH MCC[MS-DRG]: “PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITH MCC (MDC 08)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 543 — PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITH CC[MS-DRG]: “PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITH CC (MDC 08)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 544 — PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITHOUT CC/MCC[MS-DRG]: “PATHOLOGICAL FRACTURES AND MUSCULOSKELETAL AND CONNECTIVE TISSUE MALIGNANCY WITHOUT CC/MCC (MDC 08)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 791 — PREMATURITY WITH MAJOR PROBLEMS[MS-DRG]: “PREMATURITY WITH MAJOR PROBLEMS (MDC 15)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS[MS-DRG]: “FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

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
• MDC 15 — Newborns and Other Neonates with Conditions Originating in Perinatal Period[MDC crossing]: “Newborns and Other Neonates with Conditions Originating in Perinatal Period — 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.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Fracture, nontraumatic, NEC, atypical, femur, complete, oblique[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

• M84 — Disorder of continuity of bone[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.756D — Complete transverse atypical femoral fracture, unspecified leg, subsequent encounter for fracture with routine healing[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.756G — Complete transverse atypical femoral fracture, unspecified leg, subsequent encounter for fracture with delayed healing[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.756K — Complete transverse atypical femoral fracture, unspecified leg, subsequent encounter for fracture with nonunion[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.756P — Complete transverse atypical femoral fracture, unspecified leg, subsequent encounter for fracture with malunion[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.756S — Complete transverse atypical femoral fracture, unspecified leg, sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.757 — Complete oblique atypical femoral fracture, right leg[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• M84.757A — Complete oblique atypical femoral fracture, right leg, initial encounter for fracture[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

• FY2017 — Added to the code set[Change history]— CMS release files (code change ledger) · icd10cm-fy2017

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 M84.759A in its code family, with their registry titles.

• M84.758G — Complete oblique atypical femoral fracture, left leg, subsequent encounter for fracture with delayed healing
• M84.758K — Complete oblique atypical femoral fracture, left leg, subsequent encounter for fracture with nonunion
• M84.758P — Complete oblique atypical femoral fracture, left leg, subsequent encounter for fracture with malunion
• M84.758S — Complete oblique atypical femoral fracture, left leg, sequela
• M84.759 — Complete oblique atypical femoral fracture, unspecified leg
• M84.759D — Complete oblique atypical femoral fracture, unspecified leg, subsequent encounter for fracture with routine healing
• M84.759G — Complete oblique atypical femoral fracture, unspecified leg, subsequent encounter for fracture with delayed healing
• M84.759K — Complete oblique atypical femoral fracture, unspecified leg, subsequent encounter for fracture with nonunion
• M84.759P — Complete oblique atypical femoral fracture, unspecified leg, subsequent encounter for fracture with malunion
• M84.759S — Complete oblique atypical femoral fracture, unspecified leg, sequela

View all codes in the M84 family