ICD-10-CM Excludes1 Notes · Chapter 12 · FY 2027 L00-L99

Excludes1 Notes in Chapter 12: Diseases of the skin and subcutaneous tissue ICD-10-CM

An Excludes1 note means "NOT CODED HERE": the excluded code should never be reported together with the code above the note. In Chapter 12 (L00-L99), notes printed in the chapter name other codes 114 times, and Excludes1 Notes anywhere in the Tabular List name the chapter’s codes 89 times, covering 51 distinct codes, categories and ranges. Switch views to read the list either way.

✓ From the official FY 2027 ICD-10-CM Tabular ListDefinitions follow the Official Guidelines, Section I.A

114

References in Its Notes

References to Its Codes

Chapter Codes Named

L00-L99

Chapter 12

Excludes1 Notes by the code that carries the note

53 of 53 shown

L00 Staphylococcal scalded skin syndrome
- bullous impetigo (L01.03)
- pemphigus neonatorum (L01.03)
- toxic epidermal necrolysis [Lyell] (L51.2)
L01 Impetigo applies to 6 codes
- impetigo herpetiformis (L40.1)
L02.2 Cutaneous abscess, furuncle and carbuncle of trunk applies to 24 codes
- non-newborn omphalitis (L08.82)
- omphalitis of newborn (P38.-)
L02.3 Cutaneous abscess, furuncle and carbuncle of buttock applies to 3 codes
- pilonidal cyst with abscess (L05.01)
L03.01 Cellulitis of finger applies to 3 codes
- herpetic whitlow (B00.89)
L03.91 Acute lymphangitis, unspecified
- lymphangitis NOS (I89.1)
L04 Acute lymphadenitis applies to 6 codes
- chronic or subacute lymphadenitis, except mesenteric (I88.1)
- enlarged lymph nodes (R59.-)
- human immunodeficiency virus [HIV] disease resulting in generalized lymphadenopathy (B20)
- lymphadenitis NOS (I88.9)
- nonspecific mesenteric lymphadenitis (I88.0)
L08.0 Pyoderma
- pyoderma gangrenosum (L88)
- pyoderma vegetans (L08.81)
L08.81 Pyoderma vegetans
- pyoderma gangrenosum (L88)
- pyoderma NOS (L08.0)
L08.82 Omphalitis not of newborn
- omphalitis of newborn (P38.-)
Block note Block L10-L14 Bullous disorders applies to 26 codes
- benign familial pemphigus [Hailey-Hailey] (Q82.8)
- staphylococcal scalded skin syndrome (L00)
- toxic epidermal necrolysis [Lyell] (L51.2)
L10 Pemphigus applies to 9 codes
- pemphigus neonatorum (L01.03)
L11.0 Acquired keratosis follicularis
- keratosis follicularis (congenital) [Darier-White] (Q82.8)
L12 Pemphigoid applies to 8 codes
- herpes gestationis (O26.4-)
- impetigo herpetiformis (L40.1)
L12.3 Acquired epidermolysis bullosa applies to 3 codes
- epidermolysis bullosa (congenital) (Q81.-)
L13.0 Dermatitis herpetiformis
- juvenile dermatitis herpetiformis (L12.2)
- senile dermatitis herpetiformis (L12.0)
L23 Allergic contact dermatitis applies to 11 codes
- allergy NOS (T78.40)
- contact dermatitis NOS (L25.9)
- dermatitis NOS (L30.9)
L24 Irritant contact dermatitis applies to 19 codes
- allergy NOS (T78.40)
- contact dermatitis NOS (L25.9)
- dermatitis NOS (L30.9)
L24.A Irritant contact dermatitis due to friction or contact with body fluids applies to 4 codes
- irritant contact dermatitis related to stoma or fistula (L24.B-)
L24.A2 Irritant contact dermatitis due to fecal, urinary or dual incontinence
- diaper dermatitis (L22)
L25 Unspecified contact dermatitis applies to 8 codes
- allergic contact dermatitis (L23.-)
- allergy NOS (T78.40)
- dermatitis NOS (L30.9)
- irritant contact dermatitis (L24.-)
L25.5 Unspecified contact dermatitis due to plants, except food
- nettle rash (L50.9)
L26 Exfoliative dermatitis
- Ritter's disease (L00)
L27 Dermatitis due to substances taken internally applies to 5 codes
- allergy NOS (T78.40)
L29 Pruritus applies to 7 codes
- neurotic excoriation (L98.1)
- psychogenic pruritus (F45.8)
L41 Parapsoriasis applies to 7 codes
- poikiloderma vasculare atrophicans (L94.5)
L43 Lichen planus applies to 6 codes
- lichen planopilaris (L66.1-)
Block note Block L49-L54 Urticaria and erythema applies to 33 codes
- Lyme disease (A69.2-)
- rosacea (L71.-)
L50 Urticaria applies to 9 codes
- allergic contact dermatitis (L23.-)
- angioneurotic edema (T78.3)
- giant urticaria (T78.3)
- hereditary angio-edema (D84.1)
- Quincke's edema (T78.3)
- serum urticaria (T80.6-)
- solar urticaria (L56.3)
- urticaria neonatorum (P83.8)
- urticaria papulosa (L28.2)
- urticaria pigmentosa (D47.01)
L51 Erythema multiforme applies to 6 codes
- staphylococcal scalded skin syndrome (L00)
- Ritter's disease (L00)
L52 Erythema nodosum
- tuberculous erythema nodosum (A18.4)
L53 Other erythematous conditions applies to 6 codes
- erythema ab igne (L59.0)
- erythema due to external agents in contact with skin (L23-L25)
- erythema intertrigo (L30.4)
L53.0 Toxic erythema
- neonatal erythema toxicum (P83.1)
Block note Block L60-L75 Disorders of skin appendages applies to 85 codes
- congenital malformations of integument (Q84.-)
L65 Other nonscarring hair loss applies to 5 codes
- trichotillomania (F63.3)
L67 Hair color and hair shaft abnormalities applies to 4 codes
- monilethrix (Q84.1)
- pili annulati (Q84.1)
- telogen effluvium (L65.0)
L68 Hypertrichosis applies to 6 codes
- congenital hypertrichosis (Q84.2)
- persistent lanugo (Q84.2)
L75 Apocrine sweat disorders applies to 5 codes
- dyshidrosis (L30.1)
- hidradenitis suppurativa (L73.2)
L76.0 Intraoperative hemorrhage and hematoma of skin and subcutaneous tissue complicating a procedure applies to 2 codes
- intraoperative hemorrhage and hematoma of skin and subcutaneous tissue due to accidental puncture and laceration during a procedure (L76.1-)
L81 Other disorders of pigmentation applies to 10 codes
- birthmark NOS (Q82.5)
- Peutz-Jeghers syndrome (Q85.89)
L85.0 Acquired ichthyosis
- congenital ichthyosis (Q80.-)
L85.1 Acquired keratosis [keratoderma] palmaris et plantaris
- inherited keratosis palmaris et plantaris (Q82.8)
L86 Keratoderma in diseases classified elsewhere
- gonococcal keratoderma (A54.89)
- gonococcal keratosis (A54.89)
- keratoderma due to vitamin A deficiency (E50.8)
- keratosis due to vitamin A deficiency (E50.8)
- xeroderma due to vitamin A deficiency (E50.8)
L87 Transepidermal elimination disorders applies to 5 codes
- granuloma annulare (perforating) (L92.0)
L88 Pyoderma gangrenosum
- dermatitis gangrenosa (L08.0)
L92.1 Necrobiosis lipoidica, not elsewhere classified
- necrobiosis lipoidica associated with diabetes mellitus (E08-E13 with .620)
L93 Lupus erythematosus applies to 3 codes
- lupus exedens (A18.4)
- lupus vulgaris (A18.4)
- scleroderma (M34.-)
- systemic lupus erythematosus (M32.-)
L94 Other localized connective tissue disorders applies to 9 codes
- systemic connective tissue disorders (M30-M36)
L95 Vasculitis limited to skin, not elsewhere classified applies to 4 codes
- angioma serpiginosum (L81.7)
- Henoch(-Schönlein) purpura (D69.0)
- hypersensitivity angiitis (M31.0)
- lupus panniculitis (L93.2)
- panniculitis NOS (M79.3)
- panniculitis of neck and back (M54.0-)
- polyarteritis nodosa (M30.0)
- relapsing panniculitis (M35.6)
- rheumatoid vasculitis (M05.2)
- serum sickness (T80.6-)
- urticaria (L50.-)
- Wegener's granulomatosis (M31.3-)
L98.1 Factitial dermatitis
- Excoriation (skin-picking) disorder (F42.4)
L98.5 Mucinosis of the skin
- focal oral mucinosis (K13.79)
- myxedema (E03.9)
L98.6 Other infiltrative disorders of the skin and subcutaneous tissue
- hyalinosis cutis et mucosae (E78.89)
L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
- skin disorders in diabetes (E08-E13 with .62-)
- skin disorders in gonorrhea (A54.89)
- skin disorders in syphilis (A51.31, A52.79)

The first view lists notes printed in this chapter (a note on a category or block applies to every code beneath it). The second lists codes of this chapter named by Excludes1 Notes anywhere in the Tabular List, including notes in other chapters.

Questions About Excludes1 Notes

What does an Excludes1 note mean?

An Excludes1 note means “NOT CODED HERE!”: the excluded code should never be used at the same time as the code above the note. It is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition (Section I.A.12.a). The FY 2027 Tabular List has 5,411 of them; 5,284 name other codes, with 5,710 references to 3,528 distinct codes, categories and ranges.

Is there any exception to an Excludes1 note?

Yes: when the two conditions are unrelated to each other. The Guidelines’ example is F45.8, whose Excludes1 note names sleep related teeth grinding (G47.63). A patient with psychogenic dysmenorrhea (an inclusion term of F45.8) and teeth grinding may have both codes reported. If it is not clear whether the conditions are related, query the provider.

Related References

ICD-10-CM Official Guidelines ICD-10-CM Code Lookup ICD-10-CM Codes List Code Lists by Tag

Source: FY 2027 ICD-10-CM Tabular List (CMS and NCHS) and the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027, Section I.A. ICD List is not affiliated with CMS or NCHS.