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Z91.010 ICD-10-CM Code: Allergy to peanuts

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
7 Excludes2 · 1 code-also instruction

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Z91.010 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on Z91.010 itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Code Also

Additional codes that may be required to fully describe the encounter.

  • any follow-up examination (Z08-Z09)

Source: inherited from Z77-Z99

Coder workflow for Z91.010

MedCoder structured workflow — derived from this code’s own official record

Before you code Z91.010

  1. Confirm the reason for the encounter this Z code records: a status — a condition, carrier state or sequela that may affect care, distinct from a current complication of it. Check whether the code may be reported as first-listed or principal — some Z codes are limited to one position — and do not report a history or status code for a condition documented as current. Z code categories and their reporting positions (Guidelines I.C.21.c.3, I.C.21.c.15).

    Guide: Status codes (Z codes) →

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The reason for the encounter
Whether the code records the encounter’s purpose, a status, or a history — and whether it may be first-listed (Guidelines I.C.21.c).

Official instructions as workflow

  • Excludes2 — not part of Z91.010(7 notes)

    Coding workflow: The conditions named in this note are not included in Z91.010. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareZ91.02, Z88, Z77, Z77.1, N90.81, Z57

    See the official tabular notes · Guidelines I.A.12.b

  • Code Also — related condition(1 note)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    See the official tabular notes · Guidelines I.A.17

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Allergy to peanuts is a billable ICD-10-CM diagnosis code (Z91.010).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

Z88 Allergy status to drugs, medicaments and biological substances Except: Z88.9, Allergy status to unspecified drugs, medicaments and biological substances status Z89 Acquired absence of limb Z90 Acquired absence of organs, not elsewhere classified Z91.0- Allergy status, other than to drugs and biological substances Z92.82 Status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to a current facility

Verify Before Coding

  • Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Z91.010 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes2 note: Z88 — Allergy status to drugs, medicaments and biological substances (via Z91.0.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 2 Use Additional Code instructions across 2 chapters: D89.44 — Hereditary alpha tryptasemia (via Z91.0.-), K52.2 — Allergic and dietetic gastroenteritis and colitis (via Z91.01.-).

These codes instruct coders to additionally report this code when it applies.

Referenced by 1 Code Also instruction: Z87.892 — Personal history of anaphylaxis (via Z91.0.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 1 MS-DRG: DRG 951 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):FAC025 — Other specified status (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Principal diagnosis restriction (Medicare Code Editor)

Not acceptable as a principal diagnosis on an inpatient claim.

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified status).

Z88.0 — Allergy status to penicillin, Z88.1 — Allergy status to other antibiotic agents, Z88.2 — Allergy status to sulfonamides, Z88.3 — Allergy status to other anti-infective agents, Z88.4 — Allergy status to anesthetic agent, Z88.5 — Allergy status to narcotic agent, Z88.6 — Allergy status to analgesic agent, Z88.7 — Allergy status to serum and vaccine, Z88.8 — Allergy status to other drugs, medicaments and biological substances, Z88.9 — Allergy status to unspecified drugs, medicaments and biological substances, Z91.011 — Allergy to milk products, Z91.0110 — Allergy to milk products, unspecified, Z91.0111 — Allergy to milk products with tolerance to baked milk, Z91.0112 — Allergy to milk products with reactivity to baked milk, Z91.012 — Allergy to eggs, Z91.0120 — Allergy to eggs, unspecified, Z91.0121 — Allergy to eggs with tolerance to baked egg, Z91.0122 — Allergy to eggs with reactivity to baked egg, Z91.013 — Allergy to seafood, Z91.014 — Allergy to mammalian meats, +232 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “History”; these codes share that main term but sit in a different category of the Tabular List.

Z88.1 — Allergy status to other antibiotic agents (personal, allergy, antibiotic agent NEC), Z88.2 — Allergy status to sulfonamides (personal, allergy, sulfonamides), Z88.3 — Allergy status to other anti-infective agents (personal, allergy, anti-infective agent NEC), Z88.4 — Allergy status to anesthetic agent (personal, allergy, anesthetic), Z88.5 — Allergy status to narcotic agent (personal, allergy, narcotic agent NEC), Z88.6 — Allergy status to analgesic agent (personal, allergy, analgesic agent NEC), Z88.7 — Allergy status to serum and vaccine (personal, allergy, serum), Z88.8 — Allergy status to other drugs, medicaments and biological substances (personal, allergy, medicinal agents, specified NEC), Z88.9 — Allergy status to unspecified drugs, medicaments and biological substances (personal, allergy), Z90.710 — Acquired absence of both cervix and uterus (personal, hysterectomy), Z92.0 — Personal history of contraception (personal, contraception), Z92.21 — Personal history of antineoplastic chemotherapy (personal, chemotherapy for neoplastic condition), Z92.22 — Personal history of monoclonal drug therapy (personal, drug therapy, monoclonal drug), Z92.23 — Personal history of estrogen therapy (personal, estrogen therapy), Z92.240 — Personal history of inhaled steroid therapy (personal, steroid therapy, inhaled), Z92.241 — Personal history of systemic steroid therapy (personal, steroid therapy), Z92.25 — Personal history of immunosuppression therapy (personal, immunosuppression therapy), Z92.26 — Personal history of immune checkpoint inhibitor therapy (personal, ICIdrug therapy), Z92.29 — Personal history of other drug therapy (personal, drug therapy, specified NEC), Z92.3 — Personal history of irradiation (personal, irradiation), +283 more

Contextual Map

Every relationship of Z91.010 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Z91.010 with these 4 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Use Additional Code instructions

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services[MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1,235 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Allergy, allergic (reaction) (to), food NEC (any) (ingested), status (without reaction), peanuts[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • History, personal (of), allergy (to), food, peanuts[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2026), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Z91.010 — Allergy to peanuts." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/z91.010-allergy-to-peanuts

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Allergy to peanuts

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z91.010 in its code family, with their registry titles.

View all codes in the Z91 family