S00.421 ICD 10 Code is a non-billable and non-specific code and should not be used to indicate a diagnosis for reimbursement purposes. There are other codes below it with greater level of diagnosis detail. The 2023 edition of the American ICD-10-CM code became effective on October 1, 2022.
Codes
- S00.421A Blister (nonthermal) of right ear, initial encounter
- S00.421D Blister (nonthermal) of right ear, subsequent encounter
- S00.421S Blister (nonthermal) of right ear, sequela
Possible back-references that may be applicable or related to S00.421 ICD10 Code:
- S00-T88 Injury, poisoning and certain other consequences of external causes
- S00-S09 Injuries to the head
- S00 Superficial injury of head
- S00.0 Superficial injury of scalp
- S00.00 Unspecified superficial injury of scalp
- S00.01 Abrasion of scalp
- S00.02 Blister (nonthermal) of scalp
- S00.03 Contusion of scalp
- S00.04 External constriction of part of scalp
- S00.05 Superficial foreign body of scalp
- S00.06 Insect bite (nonvenomous) of scalp
- S00.07 Other superficial bite of scalp
- S00.1 Contusion of eyelid and periocular area
- S00.10 Contusion of unspecified eyelid and periocular area
- S00.11 Contusion of right eyelid and periocular area
- S00.12 Contusion of left eyelid and periocular area
- S00.2 Other and unspecified superficial injuries of eyelid and periocular area
- S00.20 Unspecified superficial injury of eyelid and periocular area
- S00.21 Abrasion of eyelid and periocular area
- S00.22 Blister (nonthermal) of eyelid and periocular area
- S00.24 External constriction of eyelid and periocular area
- S00.25 Superficial foreign body of eyelid and periocular area
- S00.26 Insect bite (nonvenomous) of eyelid and periocular area
- S00.27 Other superficial bite of eyelid and periocular area
- S00.3 Superficial injury of nose
- S00.30 Unspecified superficial injury of nose
- S00.31 Abrasion of nose
- S00.32 Blister (nonthermal) of nose
- S00.33 Contusion of nose
- S00.34 External constriction of nose
- S00.35 Superficial foreign body of nose
- S00.36 Insect bite (nonvenomous) of nose
- S00.37 Other superficial bite of nose
- S00.4 Superficial injury of ear
- S00.40 Unspecified superficial injury of ear
- S00.41 Abrasion of ear
- S00.42 Blister (nonthermal) of ear
- S00.43 Contusion of ear
- S00.44 External constriction of ear
- S00.45 Superficial foreign body of ear
- S00.46 Insect bite (nonvenomous) of ear
- S00.47 Other superficial bite of ear
- S00.5 Superficial injury of lip and oral cavity
- S00.50 Unspecified superficial injury of lip and oral cavity
- S00.51 Abrasion of lip and oral cavity
- S00.52 Blister (nonthermal) of lip and oral cavity
- S00.53 Contusion of lip and oral cavity
- S00.54 External constriction of lip and oral cavity
- S00.55 Superficial foreign body of lip and oral cavity
- S00.56 Insect bite (nonvenomous) of lip and oral cavity
- S00.57 Other superficial bite of lip and oral cavity
- S00.8 Superficial injury of other parts of head
- S00.80 Unspecified superficial injury of other part of head
- S00.81 Abrasion of other part of head
- S00.82 Blister (nonthermal) of other part of head
- S00.83 Contusion of other part of head
- S00.84 External constriction of other part of head
- S00.85 Superficial foreign body of other part of head
- S00.86 Insect bite (nonvenomous) of other part of head
- S00.87 Other superficial bite of other part of head
- S00.9 Superficial injury of unspecified part of head
- S00.90 Unspecified superficial injury of unspecified part of head
- S00.91 Abrasion of unspecified part of head
- S00.92 Blister (nonthermal) of unspecified part of head
- S00.93 Contusion of unspecified part of head
- S00.94 External constriction of unspecified part of head
- S00.95 Superficial foreign body of unspecified part of head
- S00.96 Insect bite (nonvenomous) of unspecified part of head
- S00.97 Other superficial bite of unspecified part of head
Present On Admission (POA Exempt)
S00.421 ICD 10 code is considered exempt from POA reporting
Clinical information about S00.421 ICD 10 code
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:
- Burns
- Sunburn
- Frostbite
- Eczema
- Allergic reactions
- Poison ivy, oak, and sumac
- Autoimmune diseases such as pemphigus
- Epidermolysis bullosa, an illness that causes the skin to be fragile
- Viral infections such as varicella zoster (which causes chickenpox and shingles) and herpes simplex (which causes cold sores)
- Skin infections including impetigo
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:
- The blister looks infected - if it is draining pus, or the area around the blister is red, swollen, warm, or very painful
- You have a fever
- You have several blisters, especially if you cannot figure out what is causing them
- You have health problems such as circulation problems or diabetes
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:
- Make sure that your shoes fit properly
- Always wear socks with your shoes, and make sure that the socks fit well. You may want to wear socks that are acrylic or nylon, so they keep moisture away from your feet.
- Wear gloves or protective gear on your hands when you use any tools or sports equipment that cause friction.