2027 ICD-10-CM Diagnosis Code Z88.0Allergy status to penicillin
Z88.0 is a billable ICD-10-CM diagnosis code for allergy status to penicillin. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z88.0.
Present on Admission (POA)Billing
Z88.0 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Allergy to amdinocillin
- Allergy to amdinocillin pivoxil
- Allergy to amoxicillin
- Allergy to amoxicillin and/or clavulanic acid
- Allergy to ampicillin
- Allergy to ampicillin and/or cloxacillin
- Allergy to ampicillin and/or floxacillin
- Allergy to azlocillin
- Allergy to bacampicillin
- Allergy to benethamine penicillin
- Allergy to carbenicillin
- Allergy to carfecillin
- Allergy to clavulanic acid and/or ticarcillin
- Allergy to cloxacillin
- Allergy to cyclacillin
- Allergy to floxacillin
- Allergy to methicillin
- Allergy to mezlocillin
- Allergy to penicillin
- Allergy to penicillin G
- Allergy to penicillin V
- Allergy to phenethicillin
- Allergy to piperacillin
- Allergy to piperacillin and/or tazobactam
- Allergy to pivampicillin
- Allergy to pivampicillin and/or pivmecillinam
- Allergy to talampicillin
- Allergy to temocillin
- Allergy to ticarcillin
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z88.0: its own notes plus those printed at Z88, block Z77-Z99, and Chapter 21. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Notes
General instructions on how these codes are used.
- 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:
- (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.
- (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.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Z88.0, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming Z88.0: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
personal (of) See Also: History, family (of);
penicillin Z88.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
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Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Z88.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z88.0Overview
What is the ICD-10 code for allergy status to penicillin?
The ICD-10-CM code for allergy status to penicillin is Z88.0 (sometimes written as Z880). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Z88.0 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report allergy status to penicillin on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Z88.0 group to?
On inpatient claims, allergy status to penicillin maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.
Can Z88.0 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because allergy status to penicillin describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z88.0 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for allergy status to penicillin on inpatient claims. The code appears in the Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99) range of the CMS exempt list.
