2020 ICD-10-CM Diagnosis Code L99

Other disorders of skin and subcutaneous tissue in diseases classified elsewhere

    2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
  • L99 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Oth disorders of skin, subcu in diseases classd elswhr
  • The 2020 edition of ICD-10-CM L99 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of L99 - other international versions of ICD-10 L99 may differ.
ICD-10-CM Coding Rules
  • L99 describes the manifestation of an underlying disease, not the disease itself.
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • underlying disease, such as:
  • amyloidosis (
    ICD-10-CM Diagnosis Code E85
    • E85 Amyloidosis
      • E85.0 Non-neuropathic heredofamilial amyloidosis
      • E85.1 Neuropathic heredofamilial amyloidosis
      • E85.2 Heredofamilial amyloidosis, unspecified
      • E85.3 Secondary systemic amyloidosis
      • E85.4 Organ-limited amyloidosis
      • E85.8 Other amyloidosis
        • E85.81 Light chain (AL) amyloidosis
        • E85.82 Wild-type transthyretin-related (ATTR) amyloi...
        • E85.89 Other amyloidosis
      • E85.9 Amyloidosis, unspecified
    E85.-
    )
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as L99. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • skin disorders in diabetes (E08-E13
    ICD-10-CM Range E08-E13

    Diabetes mellitus

    • E08 Diabetes mellitus due to underlying cond...
    • E09 Drug or chemical induced diabetes mellit...
    • E10 Type 1 diabetes mellitus
    • E11 Type 2 diabetes mellitus
    • E13 Other specified diabetes mellitus
    with .62)
  • skin disorders in gonorrhea (
    ICD-10-CM Diagnosis Code A54.89

    Other gonococcal infections

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Gonococcal keratoderma
    • Gonococcal lymphadenitis
    A54.89
    )
  • skin disorders in syphilis (
    ICD-10-CM Diagnosis Code A51.31

    Condyloma latum

      2016 2017 2018 2019 2020 Billable/Specific Code
    A51.31
    ,
    ICD-10-CM Diagnosis Code A52.79

    Other symptomatic late syphilis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Late syphilitic leukoderma
    • Syphilis of adrenal gland
    • Syphilis of pituitary gland
    • Syphilis of thyroid gland
    • Syphilitic splenomegaly
    Type 1 Excludes
    • syphilitic leukoderma (secondary) (A51.39)
    A52.79
    )
The following code(s) above L99 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to L99:
  • L00-L99
    2020 ICD-10-CM Range L00-L99

    Diseases of the skin and subcutaneous tissue

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • lipomelanotic reticulosis (I89.8)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • viral warts (B07.-)
    Diseases of the skin and subcutaneous tissue
Approximate Synonyms
  • Cutaneous amyloidosis
  • Lichen amyloidosis
ICD-10-CM L99 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 606 Minor skin disorders with mcc
  • 607 Minor skin disorders without mcc

Convert L99 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
ICD-10-CM Codes Adjacent To L99
L98.494 …… with necrosis of bone
L98.495 …… with muscle involvement without evidence of necrosis
L98.496 …… with bone involvement without evidence of necrosis
L98.498 …… with other specified severity
L98.499 …… with unspecified severity
L98.5 Mucinosis of the skin
L98.6 Other infiltrative disorders of the skin and subcutaneous tissue
L98.7 Excessive and redundant skin and subcutaneous tissue
L98.8 Other specified disorders of the skin and subcutaneous tissue
L98.9 Disorder of the skin and subcutaneous tissue, unspecified
L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
M00 Pyogenic arthritis
M00.0 Staphylococcal arthritis and polyarthritis
M00.00 Staphylococcal arthritis, unspecified joint
M00.01 Staphylococcal arthritis, shoulder
M00.011 Staphylococcal arthritis, right shoulder
M00.012 Staphylococcal arthritis, left shoulder
M00.019 Staphylococcal arthritis, unspecified shoulder
M00.02 Staphylococcal arthritis, elbow
M00.021 Staphylococcal arthritis, right elbow
M00.022 Staphylococcal arthritis, left elbow

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.