A00-A09 — Intestinal infectious diseases
ICD-10-CM codes A00-A09 cover intestinal infectious diseases, within certain infectious and parasitic diseases. The block holds 94 codes across 10 categories, of which 79 are billable and 15 are header codes that cannot be submitted on a claim.
Risk adjustment in A00-A09
0 codes in this block map to a CMS-HCC, which means the diagnosis carries a risk-adjustment payment when it is documented and coded. Under-coding here is money left on the table; over-coding here is what audits are for.
- HCC 92 Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
- HCC 2 Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock
- HCC 6 Opportunistic Infections
- HCC 283 Empyema, Lung Abscess
What else to watch in A00-A09
- 71 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.
Categories in A00-A09
- A00Cholera
- A01Typhoid and paratyphoid fevers
- A02Other salmonella infections
- A03Shigellosis
- A04Other bacterial intestinal infections
- A05Other bacterial foodborne intoxications, not elsewhere classified
- A06Amebiasis
- A07Other protozoal intestinal diseases
- A08Viral and other specified intestinal infections
- A09Infectious gastroenteritis and colitis, unspecified