M31.10

Billable

Thrombotic microangiopathy, unspecified

HCC Category Mapping

V28HCC 112 — Von Willebrand Disease and Other Coagulation Defects

0.247

V24HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.307

ESRDHCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease

0.000

RxHCCHCC 84 — Vasculitis and Other Autoimmune Disorders

0.000

What This Code Means

A condition where small blood vessels become blocked by clots, but the specific cause has not been determined.

Coding Tips

•Use this code only when the type of thrombotic microangiopathy cannot be specified
•Consider if more specific codes (M31.11 or M31.19) apply before using this unspecified code

Clinical Significance

Thrombotic microangiopathy represents a serious condition involving widespread microvascular thrombosis that can lead to organ failure and death if untreated. The unspecified nature indicates the underlying cause hasn't been determined, requiring urgent diagnostic workup and supportive care.

Documentation Requirements

✓Clinical evidence of microangiopathic hemolytic anemia
✓Thrombocytopenia documentation
✓Organ dysfunction evidence (neurologic, renal)
✓Blood smear showing schistocytes
✓Laboratory workup excluding specific TMA causes
✓Documentation of acute presentation
✓Treatment response monitoring
✓Assessment of organ recovery

Commonly Confused Codes

M31.11 — HSCT-associated thrombotic microangiopathy (when stem cell transplant related)D59.3 — Hemolytic-uremic syndrome (when HUS criteria met)M31.1 — Thrombotic thrombocytopenic purpura (when TTP diagnosed)D69.6 — Thrombocytopenia, unspecified (isolated platelet disorder)N17.9 — Acute kidney failure, unspecified (when only renal component coded)

Code Hierarchy

└M31Other necrotizing vasculopathies └M31.1Thrombotic microangiopathy └M31.10Thrombotic microangiopathy, unspecified

└M31.10Thrombotic microangiopathy, unspecified