Specific code 2014 ICD-9-CM Diagnosis Code 446.6
Thrombotic microangiopathy
  • Billable Code
  • Short description: Thrombot microangiopathy.
  • ICD-9-CM 446.6 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 446.6 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Clinical Information
  • A kind of blood disorder that causes blood clots to form in blood vessels around the body
  • Diseases that result in thrombosis in microvasculature. The two most prominent diseases are purpura, thrombotic thrombocytopenic; and hemolytic-uremic syndrome. Multiple etiological factors include vascular endothelial cell damage due to shiga toxin; factor h deficiency; and aberrant von willebrand factor formation.
  • The syndromes of microangiopathic hemolytic anemia, thrombocytopenia, and variable signs of organ impairment, due to platelet aggregation in the microcirculation.
Applies To
  • Moschcowitz's syndrome
  • Thrombotic thrombocytopenic purpura
Convert to ICD-10-CM: 446.6 converts directly to:
  • 2014 ICD-10-CM M31.1 Thrombotic microangiopathy
ICD-9-CM Volume 2 Index entries containing back-references to 446.6:
  • Anemia 285.9
    • hemolytic 283.9
      • acquired 283.9
        • with hemoglobinuria NEC 283.2
        • autoimmune (cold type) (idiopathic) (primary) (secondary) (symptomatic) (warm type) 283.0
        • due to
          • cold reactive antibodies 283.0
          • drug exposure 283.0
          • warm reactive antibodies 283.0
        • fragmentation 283.19
        • idiopathic (chronic) 283.9
        • infectious 283.19
        • non-autoimmune 283.10
        • toxic 283.19
        • traumatic cardiac 283.19
      • acute 283.9
        • due to enzyme deficiency NEC 282.3
        • fetus or newborn (see also Disease, hemolytic) 773.2
        • Lederer's (acquired infectious hemolytic anemia) 283.19
      • autoimmune (acquired) 283.0
      • chronic 282.9
      • cold type (secondary) (symptomatic) 283.0
      • congenital (spherocytic) (see also Spherocytosis) 282.0
        • nonspherocytic - see Anemia, hemolytic, nonspherocytic, congenital
      • drug-induced 283.0
      • due to
        • cardiac conditions 283.19
        • drugs 283.0
        • enzyme deficiency NEC 282.3
        • presence of shunt or other internal prosthetic device 283.19
        • thrombotic thrombocytopenic purpura 446.6
      • elliptocytotic (see also Elliptocytosis) 282.1
      • familial 282.9
      • hereditary 282.9
        • due to enzyme deficiency NEC 282.3
        • specified NEC 282.8
      • idiopathic (chronic) 283.9
      • infectious (acquired) 283.19
      • mechanical 283.19
      • microangiopathic 283.19
      • nonautoimmune 283.10
      • nonspherocytic
      • of or complicating pregnancy 648.2
      • resulting from presence of shunt or other internal prosthetic device 283.19
      • secondary 283.19
      • sickle-cell - see Disease, sickle-cell
      • Stransky-Regala type (Hb-E) (see also Disease, hemoglobin) 282.7
      • symptomatic 283.19
      • toxic (acquired) 283.19
      • uremic (adult) (child) 283.11
      • warm type (secondary) (symptomatic) 283.0
  • Baehr-Schiffrin disease (thrombotic thrombocytopenic purpura) 446.6
  • Disease, diseased - see also Syndrome
    • Baehr-Schiffrin (thrombotic thrombocytopenic purpura) 446.6
  • Microangiopathy 443.9
    • thrombotic 446.6
      • Moschcowitz's (thrombotic thrombocytopenic purpura) 446.6
  • Moschcowitz's syndrome (thrombotic thrombocytopenic purpura) 446.6
  • Purpura 287.2
    • thrombocytopenic (see also Thrombocytopenia) 287.30
    • thrombotic 446.6
      • thrombocytic 446.6
      • thrombocytopenic 446.6
  • Syndrome - see also Disease
    • disseminated platelet thrombosis 446.6
    • Moschcowitz (-Singer-Symmers) (thrombotic thrombocytopenic purpura) 446.6
  • Thrombocytopenia, thrombocytopenic 287.5
    • purpura (see also Purpura, thrombocytopenic) 287.30
      • thrombotic 446.6
  • Thrombosis, thrombotic (marantic) (multiple) (progressive) (vein) (vessel) 453.9
    • arteriolar-capillary platelet, disseminated 446.6
    • capillary 448.9
      • arteriolar, generalized 446.6
    • platelet 446.6
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 446.6 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.