2024 ICD-10-CM Diagnosis Code Q85.9

Phakomatosis, unspecified

ICD-10-CM Code:
Q85.9
ICD-10 Code for:
Phakomatosis, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

Code Classification

  • Congenital malformations, deformations and chromosomal abnormalities
    (Q00-Q99)
    • Other congenital malformations
      (Q80-Q89)
      • Phakomatoses, not elsewhere classified
        (Q85)

Q85.9 is a billable diagnosis code used to specify a medical diagnosis of phakomatosis, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Unspecified diagnosis codes like Q85.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Bilateral congenital hamartoma of irises
  • Congenital hamartoma
  • Congenital hamartoma of skin
  • Connective tissue nevus of skin
  • Hamartoma
  • Hamartoma of duodenal gland
  • Hamartoma of intestine
  • Hamartoma of small intestine
  • Hamartoma of tongue
  • Heart defect, tongue hamartoma, polysyndactyly syndrome
  • Linear basal cell nevus
  • Neoplasm and/or hamartoma
  • Neurocutaneous syndrome
  • Paving stone nevus
  • Port-wine stain in proteus syndrome
  • Port-wine stain of skin
  • Proteus syndrome

Clinical Classification

Clinical Information

  • Proteus Syndrome

    hamartoneoplastic malformation syndrome of uncertain etiology characterized by partial gigantism of the hands and/or feet, asymmetry of the limbs, plantar hyperplasia, hemangiomas (hemangioma), lipomas (lipoma), lymphangiomas (lymphangioma), epidermal nevi; macrocephaly; cranial hyperostosis, and long-bone overgrowth. joseph merrick, the so-called "elephant man", apparently suffered from proteus syndrome and not neurofibromatosis, a disorder with similar characteristics.
  • Hamartoma

    a focal malformation resembling a neoplasm, composed of an overgrowth of mature cells and tissues that normally occur in the affected area.
  • Hamartoma Syndrome, Multiple

    a hereditary disease characterized by multiple ectodermal, mesodermal, and endodermal nevoid and neoplastic anomalies. facial trichilemmomas and papillomatous papules of the oral mucosa are the most characteristic lesions. individuals with this syndrome have a high risk of breast cancer; thyroid cancer; and endometrial cancer. this syndrome is associated with mutations in the gene for pten phosphatase.
  • Peutz-Jeghers Syndrome

    a hereditary disease caused by autosomal dominant mutations involving chromosome 19. it is characterized by the presence of intestinal polyps, consistently in the jejunum, and mucocutaneous pigmentation with melanin spots of the lips, buccal mucosa, and digits.
  • Proteus Syndrome

    a very rare congenital disorder characterized by the development of multiple cutaneous and subcutaneous lesions including lipomas, nevi, and vascular malformations, associated with partial gigantism or digital overgrowth.
  • Congenital Hamartoma

    a hamartomatous lesion which is present at birth.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Hamartosis NOS

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

  • - Phakomatosis - See Also: specific eponymous syndromes; - Q85.9

Present on Admission (POA)

Q85.9 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA IndicatorReason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Q85.9 to ICD-9-CM

  • ICD-9-CM Code: 759.6 - Hamartoses NEC
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Genetic Disorders

Genes are the building blocks of heredity. They are passed from parent to child. They hold DNA, the instructions for making proteins. Proteins do most of the work in cells. They move molecules from one place to another, build structures, break down toxins, and do many other maintenance jobs.

Sometimes there is a mutation, a change in a gene or genes. The mutation changes the gene's instructions for making a protein, so the protein does not work properly or is missing entirely. This can cause a medical condition called a genetic disorder.

You can inherit a gene mutation from one or both parents. A mutation can also happen during your lifetime.

There are three types of genetic disorders:

  • Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.
  • Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. Chromosomes are the structures that hold our genes. Down syndrome is a chromosomal disorder.
  • Complex disorders, where there are mutations in two or more genes. Often your lifestyle and environment also play a role. Colon cancer is an example.

Genetic tests on blood and other tissue can identify genetic disorders.

NIH: National Library of Medicine


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.