ICD-10-CM Alphabetic Index · FY 2026 680 Entries

Corrosion in the ICD-10-CM Index ICD-10-CM

The main term Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) carries 680 index entries pointing to 448 ICD-10-CM codes. The default entry is T30.4, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.

✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026

680

Index Entries

448

Codes Referenced

T30.4

Default Code

Letter

680 of 680 shown

ICD-10-CM

Index Entries Under Corrosion 680 entries · 448 codes

Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) T30.4

abdomen, abdominal (muscle) (wall) T21.42 Non-billable

first degree T21.52 Non-billable

second degree T21.62 Non-billable

third degree T21.72 Non-billable

above elbow T22.439 Non-billable

first degree T22.539 Non-billable

left T22.432 Non-billable

first degree T22.532 Non-billable

second degree T22.632 Non-billable

third degree T22.732 Non-billable

right T22.431 Non-billable

first degree T22.531 Non-billable

second degree T22.631 Non-billable

third degree T22.731 Non-billable

second degree T22.639 Non-billable

third degree T22.739 Non-billable

alimentary tract NEC T28.7 Non-billable

ankle T25.419 Non-billable

first degree T25.519 Non-billable

left T25.412 Non-billable

first degree T25.512 Non-billable

second degree T25.612 Non-billable

third degree T25.712 Non-billable

multiple with foot see Corrosion, lower, limb, multiple, ankle and foot

right T25.411 Non-billable

first degree T25.511 Non-billable

second degree T25.611 Non-billable

third degree T25.711 Non-billable

second degree T25.619 Non-billable

third degree T25.719 Non-billable

anus see Corrosion, buttock

arm (s) (meaning upper limb (s)) see Corrosion, upper limb

axilla T22.449 Non-billable

first degree T22.549 Non-billable

left T22.442 Non-billable

first degree T22.542 Non-billable

second degree T22.642 Non-billable

third degree T22.742 Non-billable

right T22.441 Non-billable

first degree T22.541 Non-billable

second degree T22.641 Non-billable

third degree T22.741 Non-billable

second degree T22.649 Non-billable

third degree T22.749 Non-billable

back (lower) T21.44 Non-billable

first degree T21.54 Non-billable

second degree T21.64 Non-billable

third degree T21.74 Non-billable

upper T21.43 Non-billable

first degree T21.53 Non-billable

second degree T21.63 Non-billable

third degree T21.73 Non-billable

blisters - code as Corrosion, second degree, by site

breast (s) see Corrosion, chest wall

buttock (s) T21.45 Non-billable

first degree T21.55 Non-billable

second degree T21.65 Non-billable

third degree T21.75 Non-billable

calf T24.439 Non-billable

first degree T24.539 Non-billable

left T24.432 Non-billable

first degree T24.532 Non-billable

second degree T24.632 Non-billable

third degree T24.732 Non-billable

right T24.431 Non-billable

first degree T24.531 Non-billable

second degree T24.631 Non-billable

third degree T24.731 Non-billable

second degree T24.639 Non-billable

third degree T24.739 Non-billable

canthus (eye) see Corrosion, eyelid

cervix T28.8 Non-billable

cheek T20.46 Non-billable

first degree T20.56 Non-billable

second degree T20.66 Non-billable

third degree T20.76 Non-billable

chest wall T21.41 Non-billable

first degree T21.51 Non-billable

second degree T21.61 Non-billable

third degree T21.71 Non-billable

chin T20.43 Non-billable

first degree T20.53 Non-billable

second degree T20.63 Non-billable

third degree T20.73 Non-billable

colon T28.7 Non-billable

conjunctiva (and cornea) see Corrosion, cornea

cornea (and conjunctiva) T26.6 Non-billable

deep necrosis of underlying tissue - code as Corrosion, third degree, by site

dorsum of hand T23.469 Non-billable

first degree T23.569 Non-billable

left T23.462 Non-billable

first degree T23.562 Non-billable

second degree T23.662 Non-billable

third degree T23.762 Non-billable

right T23.461 Non-billable

first degree T23.561 Non-billable

second degree T23.661 Non-billable

third degree T23.761 Non-billable

second degree T23.669 Non-billable

third degree T23.769 Non-billable

ear (auricle) (external) (canal) T20.41 Non-billable

drum T28.91 Non-billable

first degree T20.51 Non-billable

second degree T20.61 Non-billable

third degree T20.71 Non-billable

elbow T22.429 Non-billable

first degree T22.529 Non-billable

left T22.422 Non-billable

first degree T22.522 Non-billable

second degree T22.622 Non-billable

third degree T22.722 Non-billable

right T22.421 Non-billable

first degree T22.521 Non-billable

second degree T22.621 Non-billable

third degree T22.721 Non-billable

second degree T22.629 Non-billable

third degree T22.729 Non-billable

entire body see Corrosion, multiple body regions

epidermal loss - code as Corrosion, second degree, by site

epiglottis T27.4 Non-billable

erythema, erythematous - code as Corrosion, first degree, by site

esophagus T28.6 Non-billable

extent (percentage of body surface)

less than 10 percent T32.0

10-19 percent (0-9 percent third degree) T32.10

with 10-19 percent third degree T32.11

20-29 percent (0-9 percent third degree) T32.20

with

10-19 percent third degree T32.21

20-29 percent third degree T32.22

30-39 percent (0-9 percent third degree) T32.30

with

10-19 percent third degree T32.31

20-29 percent third degree T32.32

30-39 percent third degree T32.33

40-49 percent (0-9 percent third degree) T32.40

with

10-19 percent third degree T32.41

20-29 percent third degree T32.42

30-39 percent third degree T32.43

40-49 percent third degree T32.44

50-59 percent (0-9 percent third degree) T32.50

with

10-19 percent third degree T32.51

20-29 percent third degree T32.52

30-39 percent third degree T32.53

40-49 percent third degree T32.54

50-59 percent third degree T32.55

60-69 percent (0-9 percent third degree) T32.60

with

10-19 percent third degree T32.61

20-29 percent third degree T32.62

30-39 percent third degree T32.63

40-49 percent third degree T32.64

50-59 percent third degree T32.65

60-69 percent third degree T32.66

70-79 percent (0-9 percent third degree) T32.70

with

10-19 percent third degree T32.71

20-29 percent third degree T32.72

30-39 percent third degree T32.73

40-49 percent third degree T32.74

50-59 percent third degree T32.75

60-69 percent third degree T32.76

70-79 percent third degree T32.77

80-89 percent (0-9 percent third degree) T32.80

with

10-19 percent third degree T32.81

20-29 percent third degree T32.82

30-39 percent third degree T32.83

40-49 percent third degree T32.84

50-59 percent third degree T32.85

60-69 percent third degree T32.86

70-79 percent third degree T32.87

80-89 percent third degree T32.88

90 percent or more (0-9 percent third degree) T32.90

with

10-19 percent third degree T32.91

20-29 percent third degree T32.92

30-39 percent third degree T32.93

40-49 percent third degree T32.94

50-59 percent third degree T32.95

60-69 percent third degree T32.96

70-79 percent third degree T32.97

80-89 percent third degree T32.98

90-99 percent third degree T32.99

extremity see Corrosion, limb

eye (s) and adnexa T26.9 Non-billable

with resulting rupture and destruction of eyeball T26.7 Non-billable

conjunctival sac see Corrosion, cornea

cornea see Corrosion, cornea

lid see Corrosion, eyelid

periocular area see Corrosion eyelid

specified site NEC T26.8 Non-billable

eyeball see Corrosion, eye

eyelid (s) T26.5 Non-billable

face see Corrosion, head

finger T23.429 Non-billable

first degree T23.529 Non-billable

left T23.422 Non-billable

first degree T23.522 Non-billable

second degree T23.622 Non-billable

third degree T23.722 Non-billable

multiple sites (without thumb) T23.439 Non-billable

with thumb T23.449 Non-billable

first degree T23.549 Non-billable

left T23.442 Non-billable

first degree T23.542 Non-billable

second degree T23.642 Non-billable

third degree T23.742 Non-billable

right T23.441 Non-billable

first degree T23.541 Non-billable

second degree T23.641 Non-billable

third degree T23.741 Non-billable

second degree T23.649 Non-billable

third degree T23.749 Non-billable

first degree T23.539 Non-billable

left T23.432 Non-billable

first degree T23.532 Non-billable

second degree T23.632 Non-billable

third degree T23.732 Non-billable

right T23.431 Non-billable

first degree T23.531 Non-billable

second degree T23.631 Non-billable

third degree T23.731 Non-billable

second degree T23.639 Non-billable

third degree T23.739 Non-billable

right T23.421 Non-billable

first degree T23.521 Non-billable

second degree T23.621 Non-billable

third degree T23.721 Non-billable

second degree T23.629 Non-billable

third degree T23.729 Non-billable

flank see Corrosion, abdomen

foot T25.429 Non-billable

first degree T25.529 Non-billable

left T25.422 Non-billable

first degree T25.522 Non-billable

second degree T25.622 Non-billable

third degree T25.722 Non-billable

multiple with ankle see Corrosion, lower, limb, multiple, ankle and foot

right T25.421 Non-billable

first degree T25.521 Non-billable

second degree T25.621 Non-billable

third degree T25.721 Non-billable

second degree T25.629 Non-billable

third degree T25.729 Non-billable

forearm T22.419 Non-billable

first degree T22.519 Non-billable

left T22.412 Non-billable

first degree T22.512 Non-billable

second degree T22.612 Non-billable

third degree T22.712 Non-billable

right T22.411 Non-billable

first degree T22.511 Non-billable

second degree T22.611 Non-billable

third degree T22.711 Non-billable

second degree T22.619 Non-billable

third degree T22.719 Non-billable

forehead T20.46 Non-billable

first degree T20.56 Non-billable

second degree T20.66 Non-billable

third degree T20.76 Non-billable

fourth degree - code as Corrosion, third degree, by site

full thickness skin loss - code as Corrosion, third degree, by site

gastrointestinal tract NEC T28.7 Non-billable

genital organs

external

female T21.47 Non-billable

first degree T21.57 Non-billable

second degree T21.67 Non-billable

third degree T21.77 Non-billable

male T21.46 Non-billable

first degree T21.56 Non-billable

second degree T21.66 Non-billable

third degree T21.76 Non-billable

internal T28.8 Non-billable

groin see Corrosion, abdominal wall

hand (s) T23.409 Non-billable

back see Corrosion, dorsum of hand

finger see Corrosion, finger

first degree T23.509 Non-billable

left T23.402 Non-billable

first degree T23.502 Non-billable

second degree T23.602 Non-billable

third degree T23.702 Non-billable

multiple sites with wrist T23.499 Non-billable

first degree T23.599 Non-billable

left T23.492 Non-billable

first degree T23.592 Non-billable

second degree T23.692 Non-billable

third degree T23.792 Non-billable

right T23.491 Non-billable

first degree T23.591 Non-billable

second degree T23.691 Non-billable

third degree T23.791 Non-billable

second degree T23.699 Non-billable

third degree T23.799 Non-billable

palm see Corrosion, palm

right T23.401 Non-billable

first degree T23.501 Non-billable

second degree T23.601 Non-billable

third degree T23.701 Non-billable

second degree T23.609 Non-billable

third degree T23.709 Non-billable

thumb see Corrosion, thumb

head (and face) (and neck) T20.40 Non-billable

cheek see Corrosion, cheek

chin see Corrosion, chin

ear see Corrosion, ear

eye (s) only see Corrosion, eye

first degree T20.50 Non-billable

forehead see Corrosion, forehead

lip see Corrosion, lip

multiple sites T20.49 Non-billable

first degree T20.59 Non-billable

second degree T20.69 Non-billable

third degree T20.79 Non-billable

neck see Corrosion, neck

nose see Corrosion, nose

scalp see Corrosion, scalp

second degree T20.60 Non-billable

third degree T20.70 Non-billable

hip (s) see Corrosion, lower, limb

inhalation see Corrosion, respiratory tract

internal organ (s) T28.90 Non-billable see also Corrosion, by site

alimentary tract T28.7 Non-billable

esophagus T28.6 Non-billable

genitourinary T28.8 Non-billable

mouth T28.5 Non-billable

pharynx T28.5 Non-billable

specified organ NEC T28.99 Non-billable

interscapular region see Corrosion, back, upper

intestine (large) (small) T28.7 Non-billable

knee T24.429 Non-billable

first degree T24.529 Non-billable

left T24.422 Non-billable

first degree T24.522 Non-billable

second degree T24.622 Non-billable

third degree T24.722 Non-billable

right T24.421 Non-billable

first degree T24.521 Non-billable

second degree T24.621 Non-billable

third degree T24.721 Non-billable

second degree T24.629 Non-billable

third degree T24.729 Non-billable

labium (majus) (minus) see Corrosion, genital organs, external, female

lacrimal apparatus, duct, gland or sac see Corrosion, eye, specified site NEC

larynx T27.4 Non-billable

with lung T27.5 Non-billable

leg (s) (meaning lower limb (s)) see Corrosion, lower limb

limb (s)

lower see Corrosion, lower, limb

upper see Corrosion, upper limb

lip (s) T20.42 Non-billable

first degree T20.52 Non-billable

second degree T20.62 Non-billable

third degree T20.72 Non-billable

lower

back see Corrosion, back

limb T24.409 Non-billable

ankle see Corrosion, ankle

calf see Corrosion, calf

first degree T24.509 Non-billable

foot see Corrosion, foot

knee see Corrosion, knee

left T24.402 Non-billable

first degree T24.502 Non-billable

second degree T24.602 Non-billable

third degree T24.702 Non-billable

multiple sites, except ankle and foot T24.499 Non-billable

ankle and foot T25.499 Non-billable

first degree T25.599 Non-billable

left T25.492 Non-billable

first degree T25.592 Non-billable

second degree T25.692 Non-billable

third degree T25.792 Non-billable

right T25.491 Non-billable

first degree T25.591 Non-billable

second degree T25.691 Non-billable

third degree T25.791 Non-billable

second degree T25.699 Non-billable

third degree T25.799 Non-billable

first degree T24.599 Non-billable

left T24.492 Non-billable

first degree T24.592 Non-billable

second degree T24.692 Non-billable

third degree T24.792 Non-billable

right T24.491 Non-billable

first degree T24.591 Non-billable

second degree T24.691 Non-billable

third degree T24.791 Non-billable

second degree T24.699 Non-billable

third degree T24.799 Non-billable

right T24.401 Non-billable

first degree T24.501 Non-billable

second degree T24.601 Non-billable

third degree T24.701 Non-billable

second degree T24.609 Non-billable

hip see Corrosion, thigh

thigh see Corrosion, thigh

third degree T24.709 Non-billable

lung (with larynx and trachea) T27.5 Non-billable

mouth T28.5 Non-billable

neck T20.47 Non-billable

first degree T20.57 Non-billable

second degree T20.67 Non-billable

third degree T20.77 Non-billable

nose (septum) T20.44 Non-billable

first degree T20.54 Non-billable

second degree T20.64 Non-billable

third degree T20.74 Non-billable

ocular adnexa see Corrosion, eye

orbit region see Corrosion, eyelid

palm T23.459 Non-billable

first degree T23.559 Non-billable

left T23.452 Non-billable

first degree T23.552 Non-billable

second degree T23.652 Non-billable

third degree T23.752 Non-billable

right T23.451 Non-billable

first degree T23.551 Non-billable

second degree T23.651 Non-billable

third degree T23.751 Non-billable

second degree T23.659 Non-billable

third degree T23.759 Non-billable

partial thickness - code as Corrosion, unspecified degree, by site

pelvis see Corrosion, trunk

penis see Corrosion, genital organs, external, male

perineum

female see Corrosion, genital organs, external, female

male see Corrosion, genital organs, external, male

periocular area see Corrosion, eyelid

pharynx T28.5 Non-billable

rectum T28.7 Non-billable

respiratory tract T27.7 Non-billable

larynx see Corrosion, larynx

specified part NEC T27.6 Non-billable

trachea see Corrosion, larynx

sac, lacrimal see Corrosion, eye, specified site NEC

scalp T20.45 Non-billable

first degree T20.55 Non-billable

second degree T20.65 Non-billable

third degree T20.75 Non-billable

scapular region T22.469 Non-billable

first degree T22.569 Non-billable

left T22.462 Non-billable

first degree T22.562 Non-billable

second degree T22.662 Non-billable

third degree T22.762 Non-billable

right T22.461 Non-billable

first degree T22.561 Non-billable

second degree T22.661 Non-billable

third degree T22.761 Non-billable

second degree T22.669 Non-billable

third degree T22.769 Non-billable

sclera see Corrosion, eye, specified site NEC

scrotum see Corrosion, genital organs, external, male

shoulder T22.459 Non-billable

first degree T22.559 Non-billable

left T22.452 Non-billable

first degree T22.552 Non-billable

second degree T22.652 Non-billable

third degree T22.752 Non-billable

right T22.451 Non-billable

first degree T22.551 Non-billable

second degree T22.651 Non-billable

third degree T22.751 Non-billable

second degree T22.659 Non-billable

third degree T22.759 Non-billable

stomach T28.7 Non-billable

temple see Corrosion, head

testis see Corrosion, genital organs, external, male

thigh T24.419 Non-billable

first degree T24.519 Non-billable

left T24.412 Non-billable

first degree T24.512 Non-billable

second degree T24.612 Non-billable

third degree T24.712 Non-billable

right T24.411 Non-billable

first degree T24.511 Non-billable

second degree T24.611 Non-billable

third degree T24.711 Non-billable

second degree T24.619 Non-billable

third degree T24.719 Non-billable

thorax (external) see Corrosion, trunk

throat (meaning pharynx) T28.5 Non-billable

thumb (s) T23.419 Non-billable

first degree T23.519 Non-billable

left T23.412 Non-billable

first degree T23.512 Non-billable

second degree T23.612 Non-billable

third degree T23.712 Non-billable

multiple sites with fingers T23.449 Non-billable

first degree T23.549 Non-billable

left T23.442 Non-billable

first degree T23.542 Non-billable

second degree T23.642 Non-billable

third degree T23.742 Non-billable

right T23.441 Non-billable

first degree T23.541 Non-billable

second degree T23.641 Non-billable

third degree T23.741 Non-billable

second degree T23.649 Non-billable

third degree T23.749 Non-billable

right T23.411 Non-billable

first degree T23.511 Non-billable

second degree T23.611 Non-billable

third degree T23.711 Non-billable

second degree T23.619 Non-billable

third degree T23.719 Non-billable

toe T25.439 Non-billable

first degree T25.539 Non-billable

left T25.432 Non-billable

first degree T25.532 Non-billable

second degree T25.632 Non-billable

third degree T25.732 Non-billable

right T25.431 Non-billable

first degree T25.531 Non-billable

second degree T25.631 Non-billable

third degree T25.731 Non-billable

second degree T25.639 Non-billable

third degree T25.739 Non-billable

tongue T28.5 Non-billable

tonsil (s) T28.5 Non-billable

total body see Corrosion, multiple body regions

trachea T27.4 Non-billable

with lung T27.5 Non-billable

trunk T21.40 Non-billable

abdominal wall see Corrosion, abdominal wall

anus see Corrosion, buttock

axilla see Corrosion, upper limb

back see Corrosion, back

breast see Corrosion, chest wall

buttock see Corrosion, buttock

chest wall see Corrosion, chest wall

first degree T21.50 Non-billable

flank see Corrosion, abdominal wall

genital

female see Corrosion, genital organs, external, female

male see Corrosion, genital organs, external, male

groin see Corrosion, abdominal wall

interscapular region see Corrosion, back, upper

labia see Corrosion, genital organs, external, female

lower back see Corrosion, back

penis see Corrosion, genital organs, external, male

perineum

female see Corrosion, genital organs, external, female

male see Corrosion, genital organs, external, male

scapular region see Corrosion, upper limb

scrotum see Corrosion, genital organs, external, male

second degree T21.60 Non-billable

shoulder see Corrosion, upper limb

specified site NEC T21.49 Non-billable

first degree T21.59 Non-billable

second degree T21.69 Non-billable

third degree T21.79 Non-billable

testes see Corrosion, genital organs, external, male

third degree T21.70 Non-billable

upper back see Corrosion, back, upper

vagina T28.8 Non-billable

vulva see Corrosion, genital organs, external, female

unspecified site with extent of body surface involved specified

less than 10 percent T32.0

10-19 percent (0-9 percent third degree) T32.10

with 10-19 percent third degree T32.11

20-29 percent (0-9 percent third degree) T32.20

with

10-19 percent third degree T32.21

20-29 percent third degree T32.22

30-39 percent (0-9 percent third degree) T32.30

with

10-19 percent third degree T32.31

20-29 percent third degree T32.32

30-39 percent third degree T32.33

40-49 percent (0-9 percent third degree) T32.40

with

10-19 percent third degree T32.41

20-29 percent third degree T32.42

30-39 percent third degree T32.43

40-49 percent third degree T32.44

50-59 percent (0-9 percent third degree) T32.50

with

10-19 percent third degree T32.51

20-29 percent third degree T32.52

30-39 percent third degree T32.53

40-49 percent third degree T32.54

50-59 percent third degree T32.55

60-69 percent (0-9 percent third degree) T32.60

with

10-19 percent third degree T32.61

20-29 percent third degree T32.62

30-39 percent third degree T32.63

40-49 percent third degree T32.64

50-59 percent third degree T32.65

60-69 percent third degree T32.66

70-79 percent (0-9 percent third degree) T32.70

with

10-19 percent third degree T32.71

20-29 percent third degree T32.72

30-39 percent third degree T32.73

40-49 percent third degree T32.74

50-59 percent third degree T32.75

60-69 percent third degree T32.76

70-79 percent third degree T32.77

80-89 percent (0-9 percent third degree) T32.80

with

10-19 percent third degree T32.81

20-29 percent third degree T32.82

30-39 percent third degree T32.83

40-49 percent third degree T32.84

50-59 percent third degree T32.85

60-69 percent third degree T32.86

70-79 percent third degree T32.87

80-89 percent third degree T32.88

90 percent or more (0-9 percent third degree) T32.90

with

10-19 percent third degree T32.91

20-29 percent third degree T32.92

30-39 percent third degree T32.93

40-49 percent third degree T32.94

50-59 percent third degree T32.95

60-69 percent third degree T32.96

70-79 percent third degree T32.97

80-89 percent third degree T32.98

90-99 percent third degree T32.99

upper limb (axilla) (scapular region) T22.40 Non-billable

above elbow see Corrosion, above elbow

axilla see Corrosion, axilla

elbow see Corrosion, elbow

first degree T22.50 Non-billable

forearm see Corrosion, forearm

hand see Corrosion, hand

interscapular region see Corrosion, back, upper

multiple sites T22.499 Non-billable

first degree T22.599 Non-billable

left T22.492 Non-billable

first degree T22.592 Non-billable

second degree T22.692 Non-billable

third degree T22.792 Non-billable

right T22.491 Non-billable

first degree T22.591 Non-billable

second degree T22.691 Non-billable

third degree T22.791 Non-billable

second degree T22.699 Non-billable

third degree T22.799 Non-billable

scapular region see Corrosion, scapular region

second degree T22.60 Non-billable

shoulder see Corrosion, shoulder

third degree T22.70 Non-billable

wrist see Corrosion, hand

uterus T28.8 Non-billable

vagina T28.8 Non-billable

vulva see Corrosion, genital organs, external, female

wrist T23.479 Non-billable

first degree T23.579 Non-billable

left T23.472 Non-billable

first degree T23.572 Non-billable

second degree T23.672 Non-billable

third degree T23.772 Non-billable

multiple sites with hand T23.499 Non-billable

first degree T23.599 Non-billable

left T23.492 Non-billable

first degree T23.592 Non-billable

second degree T23.692 Non-billable

third degree T23.792 Non-billable

right T23.491 Non-billable

first degree T23.591 Non-billable

second degree T23.691 Non-billable

third degree T23.791 Non-billable

second degree T23.699 Non-billable

third degree T23.799 Non-billable

right T23.471 Non-billable

first degree T23.571 Non-billable

second degree T23.671 Non-billable

third degree T23.771 Non-billable

second degree T23.679 Non-billable

third degree T23.779 Non-billable

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Related Index Terms

All index terms starting with C Index to Diseases and Injuries ICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.