Z77.121

Contact with and (suspected) exposure to harmful algae and algae toxins

Billable / specificPOA exempt

Z77.121 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Applicable to

  • Contact with and (suspected) exposure to (harmful) algae bloom NOS
  • Contact with and (suspected) exposure to blue-green algae bloom
  • Contact with and (suspected) exposure to brown tide
  • Contact with and (suspected) exposure to cyanobacteria bloom
  • Contact with and (suspected) exposure to Florida red tide
  • Contact with and (suspected) exposure to pfiesteria piscicida
  • Contact with and (suspected) exposure to red tide

Includes (from Z77)

  • contact with and (suspected) exposures to potential hazards to health
  • Note: Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • Note: (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • Note: (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Excludes2

Not included here — may be reported together when both conditions exist.

  • contact with and (suspected) exposure to communicable diseases (Z20.-) (from Z77)
  • exposure to (parental) (environmental) tobacco smoke in the perinatal period (P96.81) (from Z77)
  • newborn affected by noxious substances transmitted via placenta or breast milk (P04.-) (from Z77)
  • occupational exposure to risk factors (Z57.-) (from Z77)
  • retained foreign body (Z18.-) (from Z77)
  • retained foreign body fully removed (Z87.821) (from Z77)
  • toxic effects of substances chiefly nonmedicinal as to source (T51-T65) (from Z77)

Code also

An additional code may be needed.

  • any follow-up examination (Z08-Z09) (from Z77)

Also known as

  • Contact with and (suspected) exposure to (harmful) algae bloom NOS
  • Contact with and (suspected) exposure to blue-green algae bloom
  • Contact with and (suspected) exposure to brown tide
  • Contact with and (suspected) exposure to cyanobacteria bloom
  • Contact with and (suspected) exposure to Florida red tide
  • Contact with and (suspected) exposure to pfiesteria piscicida
  • Contact with and (suspected) exposure to red tide
  • Contact, algae and algae toxins
  • Contact, algae bloom
  • Contact, blue-green algae bloom
  • Contact, brown tide
  • Contact, cyanobacteria bloom
  • Contact, pfiesteria piscicida
  • Contact, red tide
  • Exposure, algae and algae toxins
  • Exposure, algae bloom
  • Exposure, blue-green algae bloom
  • Exposure, brown tide
  • Exposure, cyanobacteria bloom
  • Exposure, pfiesteria piscicida
  • Exposure, red tide

Parent code

  • Z77.12Contact with and (suspected) exposure to hazards in the physical environmentHeader

Related codes

  • Z77.120Contact with and (suspected) exposure to mold (toxic)Billable
  • Z77.122Contact with and (suspected) exposure to noiseBillable
  • Z77.123Contact with and (suspected) exposure to radon and other naturally occurring radiationBillable
  • Z77.128Contact with and (suspected) exposure to other hazards in the physical environmentBillable

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