1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. B25-B34 Other viral diseases
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4. B27- Infectious mononucleosis
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5. 2021 ICD-10-CM Diagnosis Code B27.9

2021 ICD-10-CM Diagnosis Code B27.9

Infectious mononucleosis, unspecified

2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code

• B27.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• The 2021 edition of ICD-10-CM B27.9 became effective on October 1, 2020.
• This is the American ICD-10-CM version of B27.9 - other international versions of ICD-10 B27.9 may differ.

• A common, acute infection usually caused by the epstein-barr virus (herpesvirus 4, human). There is an increase in mononuclear white blood cells and other atypical lymphocytes, generalized lymphadenopathy, splenomegaly, and occasionally hepatomegaly with hepatitis.
• Acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing.
• Infectious mononucleosis, or "mono", is an infection caused by the epstein-barr virus. The virus spreads through saliva, which is why it's sometimes called "kissing disease." mono occurs most often in 15 to 17-year-olds. However, you can get it at any age. Symptoms of mono include
  • fever
  • sore throat
  • swollen lymph glands
  sometimes you may also have a swollen spleen. Serious problems are rare. A blood test can show if you have mono. Most people get better in two to four weeks. However, you may feel tired for a few months afterward. Treatment focuses on helping symptoms and includes medicines for pain and fever, warm salt water gargles and plenty of rest and fluids.

• 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
• 2021 (effective 10/1/2020): No change

• Type 1 Excludes: K77
  , G63
  ICD-10-CM Diagnosis Code K77

  Liver disorders in diseases classified elsewhere

  2016 2017 2018 2019 2020 2021 Billable/Specific Code Manifestation Code

  Code First

  • underlying disease, such as:
  • amyloidosis (E85.-)
  • congenital syphilis (A50.0, A50.5)
  • congenital toxoplasmosis (P37.1)
  • schistosomiasis (B65.0-B65.9)

  Type 1 Excludes

  • alcoholic hepatitis (K70.1-)
  • alcoholic liver disease (K70.-)
  • cytomegaloviral hepatitis (B25.1)
  • herpesviral [herpes simplex] hepatitis (B00.81)
  • infectious mononucleosis with liver disease (B27.0-B27.9 with .9)
  • mumps hepatitis (B26.81)
  • sarcoidosis with liver disease (D86.89)
  • secondary syphilis with liver disease (A51.45)
  • syphilis (late) with liver disease (A52.74)
  • toxoplasmosis (acquired) hepatitis (B58.1)
  • tuberculosis with liver disease (A18.83)
  ICD-10-CM Diagnosis Code G63

  Polyneuropathy in diseases classified elsewhere

  2016 2017 2018 2019 2020 2021 Billable/Specific Code Manifestation Code

  Code First

  • underlying disease, such as:
  • amyloidosis (E85.-)
  • endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)
  • metabolic diseases (E70-E88)
  • neoplasm (C00-D49)
  • nutritional deficiency (E40-E64)

  Type 1 Excludes

  • polyneuropathy (in):
  • diabetes mellitus (E08-E13 with .42)
  • diphtheria (A36.83)
  • infectious mononucleosis (B27.0-B27.9 with 1)
  • Lyme disease (A69.22)
  • mumps (B26.84)
  • postherpetic (B02.23)
  • rheumatoid arthritis (M05.5-)
  • scleroderma (M34.83)
  • systemic lupus erythematosus (M32.19)

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