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Fracture Code Constructor
Build any ICD-10-CM fracture code axis by axis — with the exact CMS defaults and official guideline rationale at every step.
FY2027 update in progress. The FY2027 ICD-10-CM code set (effective 10/01/2026) is still loading, so a code may be missing or a deleted code may still show. Confirm against official CMS files before billing.
The 6-Axis Decision Framework
Is the fracture Traumatic (S codes, Ch. 19) or Pathologic (M codes, Ch. 13)?
Pathologic Fracture M-Code Categories (Guideline I.C.13.d)
- M80 — Osteoporosis with current pathological fracture (incl. wedge compression fx of vertebra)
- M84.4 — Pathological fracture, NEC (stress/insufficiency)
- M84.5 — Pathological fracture in neoplastic disease (bone lesions/mets)
- M84.6 — Pathological fracture in other disease (Paget's, osteitis)
- M48.4 — Fatigue fracture of vertebra
- M48.5 — Collapsed vertebra, NEC
7th character rules for M codes differ from S codes — see Guideline I.C.13.d.1. Use A (active), D (subsequent), G (delayed healing), K (nonunion), P (malunion), S (sequela).
Identify the bone, segment (proximal/shaft/distal), and side (1=Right, 2=Left, 9=Unspecified).
Avoid code 9. Clearinghouses routinely deny unspecified laterality claims.
Fracture Pattern (Morphology) (Guideline I.C.19.c)
- Comminuted — Broken/splintered into multiple pieces; high-energy trauma
- Transverse / Oblique — Straight crosswise or diagonal break along shaft
- Spiral — Twists around the bone axis; common in rotational injuries
- Greenstick / Torus (Buckle) — Incomplete fractures; pediatric patients only
- Segmental — Two or more distinct fractures in the same bone
⚠ CMS Default: If displaced vs. nondisplaced status is not documented → code as Displaced (Guideline I.C.19.c).
Is displacement explicitly documented?
Is skin breached over the fracture site?
Note: Not all bones carry the full open-fracture 7th character set. Verify in the Tabular List.
Cross-reference the Tabular List:
Critical CMS Mandate Defaults
Missing Displacement
You must default to Displaced. This is not optional — it is a legal coding mandate.
Missing Open/Closed
You must default to Closed. Absence of documentation = closed fracture per official guidelines.
Unspecified Laterality
Avoid using code 9. CMS clearinghouses routinely deny claims with unspecified laterality when the record shows a specific side.
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The Fracture Code Constructor teaching example is available to Individual subscribers ($12/mo) and above.
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The step-by-step teaching example with full CMS rationale is included in the Individual plan at $12/mo. Upgrade to unlock it.
Upgrade — $12/mo →Clinical Scenario
A patient presents to an orthopedic group for the first time. The orthopedist is seeing this patient after an initial ED or urgent care visit. The documentation describes a comminuted fracture of the shaft of the left femur. No skin breach is mentioned. No displacement status is specified. The visit constitutes the specialist's first evaluation for definitive treatment planning.
Step-by-Step Code Construction
| Step | Axis | Selection & Rationale | Code Segment |
|---|---|---|---|
| 1 | Etiology | Traumatic injury maps to Chapter 19 (S codes). | S72 |
| 2 | Anatomical Site | Shaft of the femur (diaphysis). The 3rd character .3 designates the femoral shaft. | S72.3 |
| 3 | Fracture Pattern | Comminuted fracture (bone broken into 3+ fragments). The 4th character 5 designates comminuted at the shaft. | S72.35 |
| 4 | Laterality | Left femur. In the S72 Tabular, digit 2 = left side. | S72.352 |
| 5 | Displacement Status | ⚠ CMS Default Applied: No displacement status documented. Per ICD-10-CM official guidelines, fractures not specified as displaced or nondisplaced must default to Displaced. Code retains S72.352. | S72.352 |
| 6 | Open vs. Closed | ⚠ CMS Default Applied: No skin breach documented. Per official guidelines, fractures not specified as open default to Closed. Code retains S72.352. | S72.352 |
| 7 | 7th Character | First time this orthopedic group is seeing the patient to determine a definitive treatment plan. Per CMS, this constitutes active management — 7th character A (initial encounter for closed fracture) applies, even though the patient was diagnosed elsewhere first. | S72.352A |
Displaced comminuted fracture of shaft of left femur, initial encounter for closed fracture
View full code detail in Lynceus →Critical CMS Coding Rationales
The "First Specialist Visit" Rule
A common misconception: an outpatient specialist visit counts as a "subsequent encounter" (D) because the patient was already diagnosed in an ED or urgent care. This is incorrect. Under CMS rules, the 7th character A (Initial Encounter) remains on the claim as long as the patient is receiving active treatment. This includes the orthopedic specialist's initial evaluation, diagnostic workup, and surgical planning — regardless of where the original diagnosis was made.
The Two Default Mandates
Because the provider's documentation did not explicitly state "displaced" or "closed," the coder is legally bound by ICD-10-CM guidelines to apply the code for a displaced and closed injury. These are not judgment calls — they are codified defaults that audit contractors expect to see applied consistently.
Required Secondary Codes (Chapter 20)
CMS guidelines require that Chapter 19 injury codes be supported by Chapter 20 External Cause codes to document how the injury occurred (e.g., fall from height, motor vehicle collision) and the location where it happened (e.g., home, public road). These are not optional in most payer contracts and may be required for accurate HCC risk adjustment.
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The interactive Fracture Code Constructor is a Pro plan feature.
Pro Plan Required
The interactive code builder — where you input your own clinical scenario and get a step-by-step axis table — is a Pro plan feature. You're currently on the Individual plan.
Upgrade to Pro →Your Step-by-Step Code Construction
| Step | Axis | Selection & Rationale | Code Segment |
|---|
Required Secondary Codes (Chapter 20)
CMS guidelines require Chapter 19 injury codes be supported by External Cause codes. Document the mechanism of injury (fall, MVA, assault…) and the place of occurrence. Query the provider if not documented.
This tool constructs a code framework based on the information you've provided and official ICD-10-CM defaults. Always verify the final code in the current ICD-10-CM Tabular List and follow your facility's official coding guidelines. This is not a substitute for credentialed coding judgment.