566Abscess of anal and rectal regions
- Legacy / Not Valid for Submission
- Replaced October 1, 2015
566 is a legacy ICD-9-CM diagnosis code for abscess of anal and rectal regions. It was valid on U.S. claims through September 30, 2015 and cannot be reported for services on or after October 1, 2015, when ICD-10-CM replaced the ICD-9 code set. Under the CMS General Equivalence Mappings, it maps to 3 ICD-10-CM candidates: K61.0, K61.1, and K61.3.
Code Identity
Convert 566 to ICD-10-CM
Based on the final CMS General Equivalence Mappings (GEMs), 566 crosswalks to the following ICD-10-CM codes. When more than one candidate is listed, pick the code the documentation supports.
Index of Diseases References
Entries in the final ICD-9-CM Index to Diseases and Injuries that point to 566. Tap the icons for the official index conventions.
- Abscess acute chronic infectional lymphangitic metastatic multiple pyogenic septic with lymphangitis SEE ALSO Cellulitis 682.9
- anorectal 566
- anus 566
- intersphincteric anus 566
- intestine intestinal 569.5
- rectal 566
- ischiorectal 566
- marginal anus 566
- pararectal 566
- perianal 566
- periproctic 566
- perirectal staphylococcal 566
- postanal 566
- rectum 566
- retrorectal 566
- Cellulitis diffuse with lymphangitis SEE ALSO Abscess 682.9
- anus 566
- perirectal 566
- rectum 566
- Fistula sinus 686.9
- ischiorectal fossa 566
Information for Patients
Abscess
An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.
Read the full article at MedlinePlus
Anal Disorders
The anus is the opening of the rectum through which stool passes out of your body. Problems with the anus are common. They include hemorrhoids, abscesses, fissures (cracks), and cancer.
Read the full article at MedlinePlus
Rectal Disorders
The rectum is the lower part of your large intestine where your body stores stool. Problems with rectum are common. They include hemorrhoids, abscesses, incontinence and cancer.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Questions About 566
Is 566 (abscess of anal and rectal regions) still a valid code?
No. This code belonged to ICD-9-CM, which the United States retired after September 30, 2015. Claims with dates of service on or after October 1, 2015 must use ICD-10-CM codes, such as K61.0, K61.1, and K61.3.
What is the ICD-10 replacement for 566?
The General Equivalence Mappings list 3 ICD-10-CM candidates for this code: K61.0 (Anal abscess), K61.1 (Rectal abscess), and K61.3 (Ischiorectal abscess). Each match is approximate, so the right choice depends on what the documentation supports.
What did 566 mean?
In the final ICD-9-CM release, this code described abscess of anal and rectal regions. It sat in block 566 Abscess of anal and rectal regions under Diseases of the digestive system (520–579).
Why does 566 map to more than one ICD-10 code?
ICD-10-CM is more specific than ICD-9-CM. The detail packed into this single legacy code was split across K61.0, K61.1, and K61.3, so the General Equivalence Mappings list every candidate rather than forcing one. The correct target is the one the documentation supports.
