Z91.0122 — Allergy to eggs with reactivity to baked egg
Is Z91.0122 billable?
Yes — Z91.0122 is billable for FY2027. Z91.0122 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Z91.0122 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Z91.0122 at a glance
| Code | Z91.0122 |
|---|---|
| Description | Allergy to eggs with reactivity to baked egg |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to Z91.0122?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name Z91.0122 directly.
CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.
Which MS-DRGs does Z91.0122 group to?
Z91.0122 sits in MDC 23 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 951Other Factors Influencing Health Statusmedical
How is Z91.0122 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Z91.0122. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Allergy, allergic › foodNEC › status › eggs › with › reactivity to baked egg (reaction) (to)
- History › personal › allergy › food › eggs › with › reactivity to baked egg
Excludes1 — never code together
The conditions below can never be reported together with Z91.0122 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Allergy to egg with tolerance to baked egg (Z91.0121)
Excludes2 — not included here — inherited from Z91
The conditions below are not part of Z91.0122, but a patient may have both at the same time. When documentation supports it, Z91.0122 and the excluded code may both be reported.
Excludes2 — not included here — inherited from Z91.0
The conditions below are not part of Z91.0122, but a patient may have both at the same time. When documentation supports it, Z91.0122 and the excluded code may both be reported.
- Allergy status to drugs, medicaments, and biological substances (Z88.-)
Excludes2 — not included here — inherited from Z91.01
The conditions below are not part of Z91.0122, but a patient may have both at the same time. When documentation supports it, Z91.0122 and the excluded code may both be reported.
- food additives allergy status (Z91.02)
Code also — inherited from Z77-Z99
Two codes may be needed to describe the condition fully. Whether Z91.0122 is sequenced first depends on the reason for the encounter.
- any follow-up examination (Z08-Z09)
How long has Z91.0122 existed?
Z91.0122 first appears in FY2026.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.