Resistance to antimicrobials, methicillin (anti-staph penicillins)

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ICD10 Diagnosis
Dx: Resistance to antimicrobials, methicillin (anti-staph penicillins)
ICD10 code: U82.1
Pre-ICD10 counterpart: MRSA Colonization (without Infection)
Charlson/ALERT Scale: none
APACHE Como Component: none
APACHE Acute Component: none
External ICD10 Documentation
This diagnosis is a part of ICD10 collection.

List of Antimicrobials Relevant Here

Methicillin, nafcillin, oxacillin, cloxacillin, dicloxacillin, flucloxacillin

Additional Info

This is not a standard ICD10 code but a ICD10 CA code. We added it for the following reason:
Antimicrobial resistance is not coded in standard ICD10.

See Non-standard ICD10 Diagnoses for other codes like this.

MRSA Guidelines

MRSA reporting is part of Critical Care Vital Signs Monitoring.


Combined code the following as a Comorbid Diagnosis (not as an Admit Diagnosis.


Some days it feels like half of our admissions have MRSA. Since this is so frequently used, is there any way that we could simplify coding this? Currently, we have to enter three separate comorbid codes, and type recognition isn't very useful, as other codes come up first when you start typing in the first letters.

  • SMW

  • Cargo

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Combined code the following

  • the appropriate code from one of the following
Infection requiring pathogen codes:
Potential infection codes:

Colonized vs local infection

  • If MRSA drawn from an abscess or deep in wound and you think it is causing the "local" infection, else code colonization.

Data Use

Julie reported in 2013 that in the past 2 years there were 2 requests for data related to these variables. It was decided that Allan with contact Dr. Embil and see if we can obtain this data from Infection Control. If so, we could import it into the database, and have our data collectors cease obtaining it.

48 hr rule


Also affected are :

Does anyone think making this one rule for all will be a problem?

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  • Julie, the above question specifically affects some projects you work with as well - do you think unifying this rule will be a problem for any of them?
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Alternate ICD10s to consider coding instead or in addition

Antibiotic resistance codes:

Candidate Combined ICD10 codes


Infections in ICD10 have combined coding requirements for some of their pathogens. Any that have antibiotic resistances would store those as Combined ICD10 codes as well. If the infection is acquired in the hospital, see Nosocomial infection, NOS. See Infections in ICD10 for more info.

Antibiotic resistance

Antibiotic resistance is coded as Combined ICD10 codes of the condition/pathogen and the resistance. See Antibiotic Resistant Organism for more info.

Antibiotic resistance codes:

Related CCI Codes

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