Is Z77.121 a billable ICD-10-CM code?

Yes. Z77.121 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Z77.121 sit in the tabular list?

Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).

Z77.121

Z77.121 — Contact with and (suspected) exposure to harmful algae and algae toxins

Billable / specific codeICD-10-CMPOA exempt

Z77.121 is a billable, specific ICD-10-CM code for contact with and (suspected) exposure to harmful algae and algae toxins. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

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

Risk adjustment

Z77.121 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How Z77.121 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z77.121.

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(Florida)
Exposure›algae and algae toxins
Exposure›algae bloom
Exposure›blue-green algae bloom
Exposure›brown tide
Exposure›cyanobacteria bloom

Related codes at this level

Codes that share Z77.12. If Z77.121 is not quite right, the correct code is usually one of these.

Questions about Z77.121

Is Z77.121 a billable ICD-10-CM code?: Yes. Z77.121 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z77.121 sit in the tabular list?: Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).