2019 ICD-10-CM Diagnosis Code Q18.1

Preauricular sinus and cyst

    2016 2017 2018 2019 Billable/Specific Code POA Exempt
  • Q18.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM Q18.1 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of Q18.1 - other international versions of ICD-10 Q18.1 may differ.
Applicable To
  • Fistula of auricle, congenital
  • Cervicoaural fistula
The following code(s) above Q18.1 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 Q18.1:
  • Q00-Q99
    2019 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • Codes from this chapter are not for use on maternal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
  • Q10-Q18
    2019 ICD-10-CM Range Q10-Q18

    Congenital malformations of eye, ear, face and neck

    Type 2 Excludes
    • cleft lip and cleft palate (Q35-Q37)
    • congenital malformation of cervical spine (Q05.0, Q05.5, Q67.5, Q76.0-Q76.4)
    • congenital malformation of larynx (Q31.-)
    • congenital malformation of lip NEC (Q38.0)
    • congenital malformation of nose (Q30.-)
    • congenital malformation of parathyroid gland (Q89.2)
    • congenital malformation of thyroid gland (Q89.2)
    Congenital malformations of eye, ear, face and neck
  • Q18
    ICD-10-CM Diagnosis Code Q18

    Other congenital malformations of face and neck

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • cleft lip and cleft palate (Q35-Q37)
    • conditions classified to Q67.0-Q67.4
    • congenital malformations of skull and face bones (Q75.-)
    • cyclopia (Q87.0)
    • dentofacial anomalies [including malocclusion] (M26.-)
    • malformation syndromes affecting facial appearance (Q87.0)
    • persistent thyroglossal duct (Q89.2)
    Other congenital malformations of face and neck
Approximate Synonyms
  • Bilateral preauricular cyst
  • Bilateral preauricular cysts
  • Bilateral preauricular fistula
  • Bilateral preauricular fistulae
  • Bilateral preauricular sinus
  • Ear pit
  • Left preauricular cyst
  • Left preauricular fistula
  • Left preauricular sinus
  • Preauricular cyst
  • Preauricular dimple
  • Preauricular fistula
  • Preauricular sinus
  • Right preauricular cyst
  • Right preauricular fistula
  • Right preauricular sinus
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Q18.1 is considered exempt from POA reporting.
ICD-10-CM Q18.1 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 154 Other ear, nose, mouth and throat diagnoses with mcc
  • 155 Other ear, nose, mouth and throat diagnoses with cc
  • 156 Other ear, nose, mouth and throat diagnoses without cc/mcc

Convert Q18.1 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
Code annotations containing back-references to Q18.1:
  • Type 1 Excludes: Q17
    , H70.8
    ICD-10-CM Diagnosis Code Q17

    Other congenital malformations of ear

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • congenital malformations of ear with impairment of hearing (Q16.0-Q16.9)
    • preauricular sinus (Q18.1)
    ICD-10-CM Diagnosis Code H70.8

    Other mastoiditis and related conditions

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • preauricular sinus and cyst (Q18.1)
    • sinus, fistula, and cyst of branchial cleft (Q18.0)

Diagnosis Index entries containing back-references to Q18.1:
  • Cyst (colloid) (mucous) (simple) (retention)
    • ear Q18.1 (external)
    • preauricular Q18.1
  • Fistula (cutaneous) L98.8
    ICD-10-CM Diagnosis Code L98.8

    Other specified disorders of the skin and subcutaneous tissue

      2016 2017 2018 2019 Billable/Specific Code
    • auricle - see also Disorder, pinna, specified type NEC
      • congenital Q18.1
    • cervical, lateral Q18.1
    • cervicoaural Q18.1
    • preauricular Q18.1 (congenital)
  • Imperfect
    • closure (congenital)
      • preauricular sinus Q18.1
  • Sinus - see also Fistula
    • preauricular Q18.1

ICD-10-CM Codes Adjacent To Q18.1
Q17.0 Accessory auricle
Q17.1 Macrotia
Q17.2 Microtia
Q17.3 Other misshapen ear
Q17.4 Misplaced ear
Q17.5 Prominent ear
Q17.8 Other specified congenital malformations of ear
Q17.9 Congenital malformation of ear, unspecified
Q18 Other congenital malformations of face and neck
Q18.0 Sinus, fistula and cyst of branchial cleft
Q18.1 Preauricular sinus and cyst
Q18.2 Other branchial cleft malformations
Q18.3 Webbing of neck
Q18.4 Macrostomia
Q18.5 Microstomia
Q18.6 Macrocheilia
Q18.7 Microcheilia
Q18.8 Other specified congenital malformations of face and neck
Q18.9 Congenital malformation of face and neck, unspecified
Q20 Congenital malformations of cardiac chambers and connections
Q20.0 Common arterial trunk

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