DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

B27 Infectious mononucleosis

  • Header · not billable

B27 is not billable. The category heads 16 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

  • Mononucleosis, infectious → B27.90
  • Adenitisepidemic, acute → B27.09
  • Adenitisinfectious (acute) (epidemic) → B27.09

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. B25-B34 Other viral diseases (B25-B34)
  3. B27 Infectious mononucleosis
Billable codes
16
Subdivisions
4
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
30

Codes in B27

  1. B27.0
    Gammaherpesviral mononucleosis
    Header
    Inclusion terms 1

    Inclusion terms

    • Mononucleosis due to Epstein-Barr virus
  2. B27.00
    Gammaherpesviral mononucleosis without complication
    Billable
  3. B27.01
    Gammaherpesviral mononucleosis with polyneuropathy
    Billable
  4. B27.02
    Gammaherpesviral mononucleosis with meningitis
    Billable
  5. B27.09
    Gammaherpesviral mononucleosis with other complications
    Billable
    Inclusion terms 1

    Inclusion terms

    • Hepatomegaly in gammaherpesviral mononucleosis
  6. B27.1
    Cytomegaloviral mononucleosis
    Header
  7. B27.10
    Cytomegaloviral mononucleosis without complications
    Billable
  8. B27.11
    Cytomegaloviral mononucleosis with polyneuropathy
    Billable
  9. B27.12
    Cytomegaloviral mononucleosis with meningitis
    Billable
  10. B27.19
    Cytomegaloviral mononucleosis with other complication
    Billable
    Inclusion terms 1

    Inclusion terms

    • Hepatomegaly in cytomegaloviral mononucleosis
  11. B27.8
    Other infectious mononucleosis
    Header
  12. B27.80
    Other infectious mononucleosis without complication
    Billable
  13. B27.81
    Other infectious mononucleosis with polyneuropathy
    Billable
  14. B27.82
    Other infectious mononucleosis with meningitis
    Billable
  15. B27.89
    Other infectious mononucleosis with other complication
    Billable
    Inclusion terms 1

    Inclusion terms

    • Hepatomegaly in other infectious mononucleosis
  16. B27.9
    Infectious mononucleosis, unspecified
    Header
  17. B27.90
    Infectious mononucleosis, unspecified without complication
    Billable
  18. B27.91
    Infectious mononucleosis, unspecified with polyneuropathy
    Billable
  19. B27.92
    Infectious mononucleosis, unspecified with meningitis
    Billable
  20. B27.99
    Infectious mononucleosis, unspecified with other complication
    Billable
    Inclusion terms 1

    Inclusion terms

    • Hepatomegaly in unspecified infectious mononucleosis

Sources of each column.

Instructions

At B27

Includes

  • glandular fever
  • monocytic angina
  • Pfeiffer's disease

Notes that also apply

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Mononucleosis, infectious → B27.90
  • Mononucleosis, infectiousEpstein-Barr (virus) → B27.00
  • Mononucleosis, infectiousgammaherpesviral → B27.00
  • Adenitisepidemic, acute → B27.09
  • Adenitisinfectious (acute) (epidemic) → B27.09
  • Mononucleosis, infectiouscytomegaloviral → B27.10
  • Mononucleosis, infectiousspecified NEC → B27.80
  • Hepatomegalyin mononucleosisgammaherpesviral → B27.09
  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmononucleosis → B27.10
  • Hepatomegalyin mononucleosisinfectious specified NEC → B27.89
  • Mononucleosis, infectiouswithpolyneuropathy → B27.91
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)in (due to)infectious mononucleosis → B27.92
  • Mononucleosis, infectiouswithmeningitis → B27.92
  • Mononucleosis, infectiouswithcomplication NEC → B27.99
  • Mononucleosis, infectiousEpstein-Barr (virus)withpolyneuropathy → B27.01
  • Mononucleosis, infectiousgammaherpesviralwithpolyneuropathy → B27.01
  • Mononucleosis, infectiousEpstein-Barr (virus)withmeningitis → B27.02
  • Mononucleosis, infectiousgammaherpesviralwithmeningitis → B27.02
  • Mononucleosis, infectiousEpstein-Barr (virus)withcomplication NEC → B27.09
  • Mononucleosis, infectiousgammaherpesviralwithcomplication NEC → B27.09
  • Mononucleosis, infectiouscytomegaloviralwithpolyneuropathy → B27.11
  • Mononucleosis, infectiouscytomegaloviralwithmeningitis → B27.12
  • Mononucleosis, infectiouscytomegaloviralwithcomplication NEC → B27.19
  • Mononucleosis, infectiousspecified NECwithpolyneuropathy → B27.81
  • Mononucleosis, infectiousspecified NECwithmeningitis → B27.82
  • Mononucleosis, infectiousspecified NECwithcomplication NEC → B27.89
  • Polyneuropathy (peripheral)in (due to)infectiousmononucleosis → B27.91
  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmononucleosiswithpolyneuropathy → B27.11
  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmononucleosiswithmeningitis → B27.12
  • Infection, infected, infective (opportunistic)cytomegalovirus, cytomegaloviralmononucleosiswithcomplication NEC → B27.19

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy