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ICD-10-CM Code A81
Atypical virus infections of central nervous system

Non-Billable Code
Non-Billable means the code is not sufficient justification for admission to an acute care hospital when used a principal diagnosis. Use a child code to capture more detail.
| ICD-10 from 2011 - 2016

ICD Code A81 is a non-billable code. To code a diagnosis of this type, you must use one of the five child codes of A81 that describes the diagnosis 'atypical virus infections of central nervous system' in more detail.

The ICD code A81 is used to code Prion

A prion (i/ˈpriːɒn/) is an infectious agent thought to be the cause of the transmissible spongiform encephalopathies (TSEs). It is composed entirely of protein material, called PrP (short for prion protein), that can fold in multiple, structurally distinct ways, at least one of which is transmissible to other prion proteins, leading to disease that is similar to viral infection. The word prion, coined in 1982 by Stanley B. Prusiner—derived from the words protein and infection, hence prion—is short for "proteinaceous infectious particle", in reference to its ability to self-propagate and transmit its conformation to other proteins. Prions were initially identified as the causative agent in animal TSEs such as bovine spongiform encephalopathy (BSE)—known popularly as "mad cow disease"—and scrapie in sheep. Human prion diseases include Creutzfeldt-Jakob Disease (CJD) and its variant (vCJD), Gerstmann–Sträussler–Scheinker syndrome, Fatal Familial Insomnia, and kuru. A recent study concluded that multiple system atrophy (MSA), a rare human neurodegenerative disease, is caused by a misfolded version of a protein called alpha-synuclein, and is therefore also classifiable as a prion disease. Several yeast proteins have been identified as having prionogenic properties as well.

Specialty: Infectious Disease
ICD 9 Code: 46

Microscopic "holes" are characteristic in prion-affected tissue sections, causing the tissue to develop a "spongy" architecture.

Coding Notes for A81 Info for medical coders on how to properly use this ICD-10 code

Code Includes Notes:
Includes notes further define, or give examples of, conditions included in the section.
Diseases of the central nervous system caused by prions
Additional Code Note:
Use Additional Code
Use Additional Code note means a second code must be used in conjunction with this code. Codes with this note are Etiology codes and must be followed by a Manifestation code or codes.
Code to identify:
Dementia with behavioral disturbance See code F02.81
Dementia without behavioral disturbance See code F02.80

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/A81