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  3. Diagnosis Codes in MS-DRG 595 - Major Skin Disorders With MCC

Diagnosis Codes in MS-DRG 595 - Major Skin Disorders With MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Major Skin Disorders with MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 595

MS-DRG Title: Major Skin Disorders with MCC

MCD: 09

Relative Weight: 2.1150 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 2.12 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 5.40 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

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    • L00 - Staphylococcal scalded skin syndrome

    • L14 - Bullous disorders in diseases classified elsewhere

    • L52 - Erythema nodosum

  • B02 - Zoster [herpes zoster]

    • B02.9 - Zoster without complications

  • C43 - Malignant melanoma of skin

    • C43.0 - Malignant melanoma of lip

    • C43.4 - Malignant melanoma of scalp and neck

    • C43.8 - Malignant melanoma of overlapping sites of skin

    • C43.9 - Malignant melanoma of skin, unspecified

  • C43.2 - Malignant melanoma of ear and external auricular canal

    • C43.20 - Malignant melanoma of unspecified ear and external auricular canal

    • C43.21 - Malignant melanoma of right ear and external auricular canal

    • C43.22 - Malignant melanoma of left ear and external auricular canal

  • C43.3 - Malignant melanoma of other and unspecified parts of face

    • C43.30 - Malignant melanoma of unspecified part of face

    • C43.31 - Malignant melanoma of nose

    • C43.39 - Malignant melanoma of other parts of face

  • C43.5 - Malignant melanoma of trunk

    • C43.51 - Malignant melanoma of anal skin

    • C43.52 - Malignant melanoma of skin of breast

    • C43.59 - Malignant melanoma of other part of trunk

  • C43.6 - Malignant melanoma of upper limb, including shoulder

    • C43.60 - Malignant melanoma of unspecified upper limb, including shoulder

    • C43.61 - Malignant melanoma of right upper limb, including shoulder

    • C43.62 - Malignant melanoma of left upper limb, including shoulder

  • C43.7 - Malignant melanoma of lower limb, including hip

    • C43.70 - Malignant melanoma of unspecified lower limb, including hip

    • C43.71 - Malignant melanoma of right lower limb, including hip

    • C43.72 - Malignant melanoma of left lower limb, including hip

  • C4A - Merkel cell carcinoma

    • C4A.0 - Merkel cell carcinoma of lip

    • C4A.4 - Merkel cell carcinoma of scalp and neck

    • C4A.8 - Merkel cell carcinoma of overlapping sites

    • C4A.9 - Merkel cell carcinoma, unspecified

  • C4A.1 - Merkel cell carcinoma of eyelid, including canthus

    • C4A.10 - Merkel cell carcinoma of unspecified eyelid, including canthus

  • C4A.11 - Merkel cell carcinoma of right eyelid, including canthus

    • C4A.111 - Merkel cell carcinoma of right upper eyelid, including canthus

    • C4A.112 - Merkel cell carcinoma of right lower eyelid, including canthus

  • C4A.12 - Merkel cell carcinoma of left eyelid, including canthus

    • C4A.121 - Merkel cell carcinoma of left upper eyelid, including canthus

    • C4A.122 - Merkel cell carcinoma of left lower eyelid, including canthus

  • C4A.2 - Merkel cell carcinoma of ear and external auricular canal

    • C4A.20 - Merkel cell carcinoma of unspecified ear and external auricular canal

    • C4A.21 - Merkel cell carcinoma of right ear and external auricular canal

    • C4A.22 - Merkel cell carcinoma of left ear and external auricular canal

  • C4A.3 - Merkel cell carcinoma of other and unspecified parts of face

    • C4A.30 - Merkel cell carcinoma of unspecified part of face

    • C4A.31 - Merkel cell carcinoma of nose

    • C4A.39 - Merkel cell carcinoma of other parts of face

  • C4A.5 - Merkel cell carcinoma of trunk

    • C4A.51 - Merkel cell carcinoma of anal skin

    • C4A.52 - Merkel cell carcinoma of skin of breast

    • C4A.59 - Merkel cell carcinoma of other part of trunk

  • C4A.6 - Merkel cell carcinoma of upper limb, including shoulder

    • C4A.60 - Merkel cell carcinoma of unspecified upper limb, including shoulder

    • C4A.61 - Merkel cell carcinoma of right upper limb, including shoulder

    • C4A.62 - Merkel cell carcinoma of left upper limb, including shoulder

  • C4A.7 - Merkel cell carcinoma of lower limb, including hip

    • C4A.70 - Merkel cell carcinoma of unspecified lower limb, including hip

    • C4A.71 - Merkel cell carcinoma of right lower limb, including hip

    • C4A.72 - Merkel cell carcinoma of left lower limb, including hip

  • D03 - Melanoma in situ

    • D03.0 - Melanoma in situ of lip

    • D03.4 - Melanoma in situ of scalp and neck

    • D03.8 - Melanoma in situ of other sites

    • D03.9 - Melanoma in situ, unspecified

  • D03.2 - Melanoma in situ of ear and external auricular canal

    • D03.20 - Melanoma in situ of unspecified ear and external auricular canal

    • D03.21 - Melanoma in situ of right ear and external auricular canal

    • D03.22 - Melanoma in situ of left ear and external auricular canal

  • D03.3 - Melanoma in situ of other and unspecified parts of face

    • D03.30 - Melanoma in situ of unspecified part of face

    • D03.39 - Melanoma in situ of other parts of face

  • D03.5 - Melanoma in situ of trunk

    • D03.51 - Melanoma in situ of anal skin

    • D03.52 - Melanoma in situ of breast (skin) (soft tissue)

    • D03.59 - Melanoma in situ of other part of trunk

  • D03.6 - Melanoma in situ of upper limb, including shoulder

    • D03.60 - Melanoma in situ of unspecified upper limb, including shoulder

    • D03.61 - Melanoma in situ of right upper limb, including shoulder

    • D03.62 - Melanoma in situ of left upper limb, including shoulder

  • D03.7 - Melanoma in situ of lower limb, including hip

    • D03.70 - Melanoma in situ of unspecified lower limb, including hip

    • D03.71 - Melanoma in situ of right lower limb, including hip

    • D03.72 - Melanoma in situ of left lower limb, including hip

  • L10 - Pemphigus

    • L10.0 - Pemphigus vulgaris

    • L10.1 - Pemphigus vegetans

    • L10.2 - Pemphigus foliaceous

    • L10.3 - Brazilian pemphigus [fogo selvagem]

    • L10.4 - Pemphigus erythematosus

    • L10.5 - Drug-induced pemphigus

    • L10.9 - Pemphigus, unspecified

  • L10.8 - Other pemphigus

  • L12 - Pemphigoid

    • L12.0 - Bullous pemphigoid

    • L12.1 - Cicatricial pemphigoid

    • L12.8 - Other pemphigoid

    • L12.9 - Pemphigoid, unspecified

  • L12.3 - Acquired epidermolysis bullosa

    • L12.30 - Acquired epidermolysis bullosa, unspecified

    • L12.31 - Epidermolysis bullosa due to drug

    • L12.35 - Other acquired epidermolysis bullosa

  • L13 - Other bullous disorders

    • L13.8 - Other specified bullous disorders

    • L13.9 - Bullous disorder, unspecified

  • L40 - Psoriasis

    • L40.0 - Psoriasis vulgaris

    • L40.2 - Acrodermatitis continua

    • L40.3 - Pustulosis palmaris et plantaris

    • L40.4 - Guttate psoriasis

    • L40.8 - Other psoriasis

    • L40.9 - Psoriasis, unspecified

  • L41 - Parapsoriasis

    • L41.0 - Pityriasis lichenoides et varioliformis acuta

    • L41.1 - Pityriasis lichenoides chronica

    • L41.3 - Small plaque parapsoriasis

    • L41.4 - Large plaque parapsoriasis

    • L41.5 - Retiform parapsoriasis

    • L41.8 - Other parapsoriasis

    • L41.9 - Parapsoriasis, unspecified

  • L51 - Erythema multiforme

    • L51.0 - Nonbullous erythema multiforme

    • L51.1 - Stevens-Johnson syndrome

    • L51.2 - Toxic epidermal necrolysis [Lyell]

    • L51.3 - Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome

    • L51.8 - Other erythema multiforme

    • L51.9 - Erythema multiforme, unspecified

  • L53 - Other erythematous conditions

    • L53.0 - Toxic erythema

    • L53.1 - Erythema annulare centrifugum

    • L53.2 - Erythema marginatum

    • L53.3 - Other chronic figurate erythema

  • L93 - Lupus erythematosus

    • L93.0 - Discoid lupus erythematosus

    • L93.1 - Subacute cutaneous lupus erythematosus

    • L93.2 - Other local lupus erythematosus

  • L94 - Other localized connective tissue disorders

    • L94.5 - Poikiloderma vasculare atrophicans

  • Q81 - Epidermolysis bullosa

    • Q81.0 - Epidermolysis bullosa simplex

    • Q81.1 - Epidermolysis bullosa letalis

    • Q81.2 - Epidermolysis bullosa dystrophica

    • Q81.8 - Other epidermolysis bullosa

    • Q81.9 - Epidermolysis bullosa, unspecified