ICD-10 Code
International Classification of Diseases, 10th Revision
Aug 19, 2017

See: Infectious mononucleosis

B27.9 is NOT a complete or valid ICD 10 diagnosis code.

You should code each health care encounter to the level of certainty known for that encounter. When sufficient clinical information is not known or available to assign a more specific code, it is acceptable to report the appropriate unspecified code.

See below for more specifc codes relating to
Infectious mononucleosis, unspecified

More specific codes for Infectious mononucleosis, unspecified

  • B27.90 - Infectious mononucleosis, unspecified without complication
  • B27.91 - Infectious mononucleosis, unspecified with polyneuropathy
  • B27.92 - Infectious mononucleosis, unspecified with meningitis
  • B27.99 - Infectious mononucleosis, unspecified with other complication
See also ICD 10 code for
See the 2017 ICD-10-CM Coding Guidelines.

When ICD 10 was implemented on October 1, 2015, it did not affect physicians', outpatient facilities', and hospital outpatient departments' use of CPT codes on Medicare Fee-For-Service claims. Providers should continue to use CPT codes to report these services.