2022 ICD-10-CM Code S00.429A

Blister (nonthermal) of unspecified ear, initial encounter

Version 2021

Valid for Submission

ICD-10:S00.429A
Short Description:Blister (nonthermal) of unspecified ear, initial encounter
Long Description:Blister (nonthermal) of unspecified ear, initial encounter

Code Classification

  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Injuries to the head (S00-S09)
      • Superficial injury of head (S00)

S00.429A is a billable diagnosis code used to specify a medical diagnosis of blister (nonthermal) of unspecified ear, initial encounter. The code S00.429A is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.

The ICD-10-CM code S00.429A might also be used to specify conditions or terms like blister of ear with infection, blister of ear without infection, blister of external auditory canal, blister of pinna, injury of external auditory canal , traumatic blister of ear region, etc.

S00.429A is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like blister (nonthermal) of unspecified ear. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Unspecified diagnosis codes like S00.429A are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Coding Guidelines

The appropriate 7th character is to be added to each code from block Superficial injury of head (S00). Use the following options for the aplicable episode of care:

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Convert S00.429A to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code S00.429A its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Information for Patients


Blisters

What are blisters?

Blisters are fluid-filled sacs on the outer layer of your skin. They form because of rubbing, heat, or diseases of the skin. They are most common on your hands and feet.

Other names for blisters are vesicles (usually for smaller blisters) and bulla (for larger blisters).

What causes blisters?

Blisters often happen when there is friction - rubbing or pressure - on one spot. For example, if your shoes don't fit quite right and they keep rubbing part of your foot. Or if you don't wear gloves when you rake leaves and the handle keeps rubbing against your hand. Other causes of blisters include

What are the treatments for blisters?

Blisters will usually heal on their own. The skin over the blister helps keep out infections. You can put a bandage on the blister to keep it clean. Make sure that there is no more rubbing or friction on the blister.

You should contact your health care provider if

Normally you don't want to drain a blister, because of the risk of infection. But if a blister is large, painful, or looks like it will pop on its own, you can drain the fluid.

Can blisters be prevented?

There are some things you can do to prevent friction blisters:


[Learn More in MedlinePlus]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)