M80 vs M84.48XK

M80 (Osteoporosis with current pathological fracture) compared with M84.48XK (Pathological fracture, other site, subsequent encounter for fracture with nonunion), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

M80

Osteoporosis with current pathological fracture

↔

M84.48XK

Pathological fracture, other site, subsequent encounter for fracture with nonunion

Not coded here — these two are mutually exclusive.

“pathological fracture NOS (M84.4)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. M80 carries an Excludes1 note covering M84.48XK: “pathological fracture NOS (M84.4)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	M80Osteoporosis with current pathological fracture	M84.48XKPathological fracture, other site, subsequent encounter for fracture with nonunion
Billing status	Non-billable header Report instead: M80.00XA, M80.00XD, M80.00XG, M80.00XK, M80.00XP	Billable
Classification	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
Definition	Osteoporosis with current pathological fracture is a non-billable ICD-10-CM category code (M80).	Pathological fracture, other site, subsequent encounter for fracture with nonunion is a billable ICD-10-CM diagnosis code (M84.48K).
7th character	The appropriate 7th character is to be added to each code from category M80:	The appropriate 7th character is to be added to each code from subcategory M84.4:
Includes	osteoporosis with current fragility fracture	—
Use additional code	code to identify major osseous defect, if applicable (M89.7-)	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources