DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

Z91 Personal risk factors, not elsewhere classified

  • Header · not billable

Z91 is not billable. The category heads 62 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Problem (with) (related to)falling → Z91.81
  • At riskforfalling → Z91.81
  • Historypersonal (of)fall, falling → Z91.81

Where it sits

  1. Chapter 21 Factors influencing health status and contact with health services (Z00-Z99)
  2. Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
  3. Z91 Personal risk factors, not elsewhere classified
Billable codes
62
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
150

Codes in Z91

  1. Z91.0
    Allergy status, other than to drugs and biological substances
    Header
    Excludes2 1

    Excludes2

    • Allergy status to drugs, medicaments, and biological substances (Z88.-) Z88
  2. Z91.01
    Food allergy status
    Header
    Excludes2 1

    Excludes2

    • food additives allergy status (Z91.02) Z91.02
  3. Z91.010
    Allergy to peanuts
    BillableExempt
  4. Z91.011
    Allergy to milk products
    Header
    Excludes1 1

    Excludes1

    • lactose intolerance (E73.-) E73
  5. Z91.0110
    Allergy to milk products, unspecified
    BillableExempt
  6. Z91.0111
    Allergy to milk products with tolerance to baked milk
    BillableExempt
    Excludes1 1

    Excludes1

    • Allergy to milk products with reactivity to baked milk (Z91.0112) Z91.0112
  7. Z91.0112
    Allergy to milk products with reactivity to baked milk
    BillableExempt
    Excludes1 1

    Excludes1

    • Allergy to milk products with tolerance to baked milk (Z91.0111) Z91.0111
  8. Z91.012
    Allergy to eggs
    Header
  9. Z91.0120
    Allergy to eggs, unspecified
    BillableExempt
  10. Z91.0121
    Allergy to eggs with tolerance to baked egg
    BillableExempt
    Excludes1 1

    Excludes1

    • Allergy to eggs with reactivity to baked egg (Z91.0122) Z91.0122
  11. Z91.0122
    Allergy to eggs with reactivity to baked egg
    BillableExempt
    Excludes1 1

    Excludes1

    • Allergy to egg with tolerance to baked egg (Z91.0121) Z91.0121
  12. Z91.013
    Allergy to seafood
    BillableExempt
    Inclusion terms 2

    Inclusion terms

    • Allergy to shellfish
    • Allergy to octopus or squid ink
  13. Z91.014
    Allergy to mammalian meats
    BillableExempt
    Inclusion terms 5

    Inclusion terms

    • Allergy to beef
    • Allergy to lamb
    • Allergy to pork
    • Allergy to red meats
    • Alpha-gal syndrome (AGS)
  14. Z91.018
    Allergy to other foods
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Allergy to nuts other than peanuts
  15. Z91.02
    Food additives allergy status
    BillableExempt
  16. Z91.03
    Insect allergy status
    Header
  17. Z91.030
    Bee allergy status
    BillableExempt
  18. Z91.038
    Other insect allergy status
    BillableExempt
  19. Z91.04
    Nonmedicinal substance allergy status
    Header
  20. Z91.040
    Latex allergy status
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Latex sensitivity status
  21. Z91.041
    Radiographic dye allergy status
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Allergy status to contrast media used for diagnostic X-ray procedure
  22. Z91.048
    Other nonmedicinal substance allergy status
    BillableExempt
  23. Z91.09
    Other allergy status, other than to drugs and biological substances
    BillableExempt
  24. Z91.1
    Patient's noncompliance with medical treatment and regimen
    Header
    Excludes2 1, Code also 1

    Excludes2

    • caregiver noncompliance with patient's medical treatment and regimen (Z91.A-) Z91.A

    Code also

    • , if applicable, to identify underdosing of specific drug (T36-T50 with final character 6) T36 T50
  25. Z91.11
    Patient's noncompliance with dietary regimen
    Header
    Code also 1

    Code also

    • , if applicable, food insecurity (Z59.4-) Z59.4
  26. Z91.110
    Patient's noncompliance with dietary regimen due to financial hardship
    BillableExempt
  27. Z91.118
    Patient's noncompliance with dietary regimen for other reason
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Inability to comply with dietary regimen
  28. Z91.119
    Patient's noncompliance with dietary regimen due to unspecified reason
    BillableExempt
  29. Z91.12
    Patient's intentional underdosing of medication regimen
    Header
    Code first 1

    Code first

    • underdosing of medication (T36-T50) with fifth or sixth character 6 T36 T50
  30. Z91.120
    Patient's intentional underdosing of medication regimen due to financial hardship
    BillableExempt
  31. Z91.128
    Patient's intentional underdosing of medication regimen for other reason
    BillableExempt
  32. Z91.13
    Patient's unintentional underdosing of medication regimen
    Header
    Code first 1

    Code first

    • underdosing of medication (T36-T50) with fifth or sixth character 6 T36 T50
  33. Z91.130
    Patient's unintentional underdosing of medication regimen due to age-related debility
    BillableExempt
  34. Z91.138
    Patient's unintentional underdosing of medication regimen for other reason
    BillableExempt
  35. Z91.14
    Patient's other noncompliance with medication regimen
    Header
    Inclusion terms 1, Code first 1

    Inclusion terms

    • Patient's underdosing of medication NOS

    Code first

    • , if applicable, adverse effect of underdosing (T36-T50) T36 T50
  36. Z91.141
    Patient's other noncompliance with medication regimen due to financial hardship
    BillableExempt
  37. Z91.148
    Patient's other noncompliance with medication regimen for other reason
    BillableExempt
  38. Z91.15
    Patient's noncompliance with renal dialysis
    Header
  39. Z91.151
    Patient's noncompliance with renal dialysis due to financial hardship
    BillableExempt
  40. Z91.158
    Patient's noncompliance with renal dialysis for other reason
    BillableExempt
  41. Z91.19
    Patient's noncompliance with other medical treatment and regimen
    Header
    Inclusion terms 1

    Inclusion terms

    • Patient's nonadherence to medical treatment
  42. Z91.190
    Patient's noncompliance with other medical treatment and regimen due to financial hardship
    BillableExempt
  43. Z91.198
    Patient's noncompliance with other medical treatment and regimen for other reason
    BillableExempt
  44. Z91.199
    Patient's noncompliance with other medical treatment and regimen due to unspecified reason
    BillableExempt
  45. Z91.A
    Caregiver's noncompliance with patient's medical treatment and regimen
    Header
  46. Z91.A1
    Caregiver's noncompliance with patient's dietary regimen
    Header
    Inclusion terms 1, Code also 1

    Inclusion terms

    • Caregiver's inability to comply with patient's dietary regimen

    Code also

    • , if applicable, food insecurity (Z59.4-) Z59.4
  47. Z91.A10
    Caregiver's noncompliance with patient's dietary regimen due to financial hardship
    BillableExempt
  48. Z91.A18
    Caregiver's noncompliance with patient's dietary regimen for other reason
    BillableExempt
  49. Z91.A2
    Caregiver's intentional underdosing of patient's medication regimen
    Header
    Code first 1

    Code first

    • underdosing of medication (T36-T50) with fifth or sixth character 6 T36 T50
  50. Z91.A20
    Caregiver's intentional underdosing of patient's medication regimen due to financial hardship
    BillableExempt
  51. Z91.A28
    Caregiver's intentional underdosing of medication regimen for other reason
    BillableExempt
  52. Z91.A3
    Caregiver's unintentional underdosing of patient's medication regimen
    BillableExempt
    Code first 1

    Code first

    • underdosing of medication (T36-T50) with fifth or sixth character 6 T36 T50
  53. Z91.A4
    Caregiver's other noncompliance with patient's medication regimen
    Header
    Inclusion terms 2

    Inclusion terms

    • Caregiver's underdosing of patient's medication NOS
    • Caregiver's underdosing with patient's medication NOS
  54. Z91.A41
    Caregiver's other noncompliance with patient's medication regimen due to financial hardship
    BillableExempt
  55. Z91.A48
    Caregiver's other noncompliance with patient's medication regimen for other reason
    BillableExempt
  56. Z91.A5
    Caregiver's noncompliance with patient's renal dialysis
    Header
  57. Z91.A51
    Caregiver's noncompliance with patient's renal dialysis due to financial hardship
    BillableExempt
  58. Z91.A58
    Caregiver's noncompliance with patient's renal dialysis for other reason
    BillableExempt
  59. Z91.A9
    Caregiver's noncompliance with patient's other medical treatment and regimen
    Header
    Inclusion terms 1

    Inclusion terms

    • Caregiver's nonadherence to patient's medical treatment
  60. Z91.A91
    Caregiver's noncompliance with patient's other medical treatment and regimen due to financial hardship
    BillableExempt
  61. Z91.A98
    Caregiver's noncompliance with patient's other medical treatment and regimen for other reason
    BillableExempt
  62. Z91.4
    Personal history of psychological trauma, not elsewhere classified
    Header
  63. Z91.41
    Personal history of adult abuse
    Header
    Excludes2 1

    Excludes2

    • personal history of abuse in childhood (Z62.81-) Z62.81
  64. Z91.410
    Personal history of adult physical and sexual abuse
    BillableExempt
    Excludes1 2

    Excludes1

  65. Z91.411
    Personal history of adult psychological abuse
    BillableExempt
  66. Z91.412
    Personal history of adult neglect
    BillableExempt
    Excludes1 1

    Excludes1

  67. Z91.413
    Personal history of adult financial abuse
    BillableExempt
  68. Z91.414
    Personal history of adult intimate partner abuse
    BillableExempt
  69. Z91.419
    Personal history of unspecified adult abuse
    BillableExempt
  70. Z91.42
    Personal history of forced labor or sexual exploitation
    BillableExempt
  71. Z91.49
    Other personal history of psychological trauma, not elsewhere classified
    BillableExempt
  72. Z91.5
    Personal history of self-harm
    Header
    Code also 1

    Code also

    • mental health disorder, if known
  73. Z91.51
    Personal history of suicidal behavior
    BillableExempt
    Inclusion terms 3

    Inclusion terms

    • Personal history of parasuicide
    • Personal history of self-poisoning
    • Personal history of suicide attempt
  74. Z91.52
    Personal history of nonsuicidal self-harm
    BillableExempt
    Inclusion terms 3

    Inclusion terms

    • Personal history of nonsuicidal self-injury
    • Personal history of self-inflicted injury without suicidal intent
    • Personal history of self-mutilation
  75. Z91.8
    Other specified personal risk factors, not elsewhere classified
    Header
  76. Z91.81
    History of falling
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • At risk for falling
  77. Z91.82
    Personal history of military deployment
    BillableExempt
    Inclusion terms 2, Excludes2 1

    Inclusion terms

    • Individual (civilian or military) with past history of military war, peacekeeping and humanitarian deployment (current or past conflict)
    • Returned from military deployment

    Excludes2

    • personal history of military service (Z91.85) Z91.85
  78. Z91.83
    Wandering in diseases classified elsewhere
    BillableExempt
    Code first 5

    Code first

    • underlying disorder such as:
    • Alzheimer's disease (G30.-) G30
    • autism or pervasive developmental disorder (F84.-) F84
    • intellectual disabilities (F70-F79) F70 F79
    • unspecified dementia with behavioral disturbance (F03.9-, F03.A-, F03.B-, F03.C-) F03.9 F03.A F03.B F03.C
  79. Z91.84
    Oral health risk factors
    Header
  80. Z91.841
    Risk for dental caries, low
    BillableExempt
  81. Z91.842
    Risk for dental caries, moderate
    BillableExempt
  82. Z91.843
    Risk for dental caries, high
    BillableExempt
  83. Z91.849
    Unspecified risk for dental caries
    BillableExempt
  84. Z91.85
    Personal history of military service
    BillableExempt
    Inclusion terms 2, Excludes2 1

    Inclusion terms

    • Personal history of serving in the armed forces
    • Personal history of veteran

    Excludes2

    • personal history of military deployment (Z91.82) Z91.82
  85. Z91.89
    Other specified personal risk factors, not elsewhere classified
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Increased risk for social isolation
  86. Z91.B
    Personal risk factor of exposure to diethylstilbestrol
    BillableExempt
    Inclusion terms 4, Code also 4

    Inclusion terms

    • DES daughter or son
    • Personal risk factor of exposure to DES
    • Personal risk factor of exposure to DES in utero
    • Second generation DES exposure

    Code also

    • , associated conditions, such as:
    • conditions classifiable to C50.- C50
    • osteoporosis (M80.-) M80
    • premature menopause (E28.31-) E28.31

Sources of each column.

Instructions

At Z91

Excludes2

  • contact with and (suspected) exposures hazardous to health (Z77.-) Z77
  • exposure to pollution and other problems related to physical environment (Z77.1-) Z77.1
  • female genital mutilation status (N90.81-) N90.81
  • occupational exposure to risk factors (Z57.-) Z57
  • personal history of physical injury and trauma (Z87.81, Z87.82-) Z87.81 Z87.82

Notes that also apply

Block Z77-Z99 instructions (Code also 1): printed on the block page.

Chapter 21 instructions (Notes 3): printed on the chapter 21 page.

Index entries

  • Underdosing → Z91.14
  • Nonadherence to medical treatment, specified NEC → Z91.199
  • Noncompliance → Z91.199
  • Allergy, allergic (reaction) (to)milk protein → Z91.0110
  • SyndromeAlpha-gal → Z91.014
  • Sensitive, sensitivitylatex → Z91.040
  • Inability tocomply with dietary regimen → Z91.118
  • Underdosingintentional NEC → Z91.128
  • Underdosingunintentional NEC → Z91.138
  • Dialysis (intermittent) (treatment)noncompliance (with) → Z91.158
  • Parasuicide (attempt)history of (personal) → Z91.51
  • Self-poisoninghistory (personal) → Z91.51
  • Suicide, suicidal (attempted)history of (personal) → Z91.51
  • Self-injury, nonsuicidalpersonal history → Z91.52
  • Problem (with) (related to)falling → Z91.81
  • Deployment (current) (military) statuspersonal history of → Z91.82
  • Deployment (current) (military) statusreturned from → Z91.82
  • Wanderingin diseases classified elsewhere → Z91.83
  • Maltreatmentpersonal history of → Z91.89
  • Problem (with) (related to)personal hygiene → Z91.89
  • DESchild (daughter) (son) → Z91.B
  • DESsecond generation → Z91.B
  • Exposure (to)risk factor, personal, to diethylstilbestrol (DES) (in utero) → Z91.B
  • Allergy, allergic (reaction) (to)food (any) (ingested) NECstatus (without reaction) → Z91.018
  • Noncompliancewithdietary regimen → Z91.119
  • Underdosingintentional NECdue to financial hardship of patient → Z91.120
  • Underdosingunintentional NECdue to patient's age related debility → Z91.130
  • Noncompliancewithmedication regimen NEC → Z91.148
  • Dialysis (intermittent) (treatment)noncompliance (with)due to financial hardship → Z91.151
  • Noncompliancewithdialysis → Z91.158
  • Noncompliancewithrenal dialysis → Z91.158
  • Nonadherence to medical treatment, specified NECdue tofinancial hardship → Z91.190
  • Nonadherence to medical treatment, specified NECdue tospecified reason NEC → Z91.198
  • Noncompliancewithmedical treatment, specified NEC → Z91.199
  • Neglectadulthistory of → Z91.412
  • Maltreatmentadulthistory of → Z91.419
  • Historypersonal (of)forced labor or sexual exploitation → Z91.42
  • Historypersonal (of)parasuicide (attempt) → Z91.51
  • Historypersonal (of)self-poisoning attempt → Z91.51
  • Historypersonal (of)suicidal behavior → Z91.51

110 more, longer entries are not listed; the search box finds them by word.

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

Hierarchy