If your patient only has nausea, report R11.0 per this nausea icd-10 code complete guide. If they have nausea with vomiting, report R11.2, unless a more specific vomiting code in R11.1x applies and the documentation supports it. As a rule, do not double-code R11.0 with an R11.1x vomiting code on the same encounter unless an official exception exists.
One digit changes the claim. The ICD-10-CM code for “nausea” alone is R11.0, and it lives under R11 (Nausea and vomiting). This nausea icd-10 code complete guide shows you when to use R11.0, when R11.2 is right, and how to avoid denials in 2026.
, R11.1x (Vomiting subtypes), and R11.2 (Nausea with vomiting), with arrows and short notes; hospital EHR screen style, white background, teal accents)
In this 2026 guide, you’ll get the exact hierarchy, step-by-step selection logic, common mistakes to avoid, and a scan-friendly table for quick picks. You’ll also see official resources and a coding workflow tip that saves clicks without cutting corners.
For related symptom-coding strategy, see the internal playbook style post on allergic rhinitis: Seasonal Allergies ICD-10 Codes: A Complete Guide to Accurate Coding.
What Is the ICD-10 Code for Nausea?
The single, correct code for nausea as the sole documented symptom is R11.0. It sits in Chapter 18 (Symptoms, signs, and abnormal clinical and laboratory findings), under R11 “Nausea and vomiting.
- R11.
- R11.
- R11.
Specifically, R11 belongs to the block R00–R99.
- R11 Nausea and vomiting
- R11.
- R11.
- R11.
- R11.
- R11.
- R11.
Why this matters: if you document “nausea only,” R11.0 is clean and correct. If you also document vomiting, you will move away from R11.0. For most notes that simply say “nausea and vomiting,” R11.2 is the right choice. However, when the note names a vomiting type, say, projectile, you should code the more specific R11.12 instead of the broader R11.2.
Importantly, codes in R11 are symptoms. Therefore, when a confirmed diagnosis explains the nausea (for example, early pregnancy, gastroenteritis, adverse effect of chemotherapy), payers may expect the underlying cause coded first with R11.x added only when guidelines allow additional symptom coding.
For official wording and current-year updates, review the CDC/NCHS ICD-10-CM browser entry for R11 (Source: CDC ICD-10-CM Browser. R11).
R11.0 vs. R11.2 vs. R11.10–R11.12 at a glance
- R11.0: Use when the note documents nausea alone.
- R11.2: Use for “nausea with vomiting” when no specific vomiting subtype is documented.
- R11.10–R11.12: Use a subtype when the note supports it (e.g., “projectile vomiting” → R11.12).
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How to Select the Right Nausea-Related ICD-10 Code: Step-by-Step
Choosing the correct code is faster when you apply a fixed sequence. Use this five-step method to keep your claims tight and your audit risk low. This section anchors the nausea icd-10 code complete process you can teach to your team.
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Confirm the primary symptom vs.
First, read the assessment for a cause. If the provider confirmed a diagnosis that explains the symptom (e.g., early pregnancy, drug adverse effect, gastroenteritis), code that condition first. Then, add a symptom code like R11.0 or R11.2 only if guidelines and payer policy allow reporting related symptoms in addition to the cause. -
Determine if vomiting is present
Second, scan the note for vomiting. If it’s not present, select R11.0. If it is present, move to R11.2 or a more specific R11.1x code. -
Choose the highest specificity level
Third, if vomiting is present, look for subtype keywords:
- “Unspecified vomiting” → R11.
- “Vomiting without nausea” → R11.
- “Projectile vomiting” → R11.
If the note simply states “nausea and vomiting” with no subtype, use R11.2.
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Check Excludes1 and Excludes2 notes
Fourth, verify the chapter and category notes. Excludes1 means “do not code both conditions together.” Excludes2 means “you may code both if the patient truly has both.” At R11, these notes prevent double-coding and diagnosis conflicts. Always verify the latest-year notes in the official browser or your encoder. -
Verify payer-specific requirements
Fifth, confirm what your payer wants for medical necessity and bundling. Some payers prefer the confirmed etiology alone when it’s clear and common (e.g., O21.- for vomiting of pregnancy). Others allow symptom-plus-cause when it changes care. Add these rules to your cheat sheet.
As you codify this into your EHR workflow in 2026, set quick-pick favorites: R11.0, R11.2, and the three common R11.1x subtypes. Then bind each to a short query template to prompt for vomiting specificity. For a broader symptom-coding reference style, see this related primer: Seasonal Allergies ICD-10 Codes: A Complete Guide to Accurate Coding.
Also Read!
Seasonal Allergies ICD-10 Codes: A Complete Guide to Accurate Coding
The Complete Guide to Epic Certification: Paths, Costs, and Career Impact
Common Mistakes When Coding Nausea in ICD-10
Missteps with R11 cost time and cause denials. Here are the traps you can avoid with one pass through the note.
First, using R11.0 when a cause is already confirmed and should be primary. For example, documented vomiting of pregnancy belongs with O21.- codes. In oncology, nausea from antineoplastic drugs may call for an adverse effect code in the T45.- family, with sequencing rules based on the note and guideline year. In such cases, a symptom code can be secondary or not reported at all, depending on the instructions.
Second, confusing R11.0 with R11.2. If the patient vomited, R11.0 alone is wrong. When you only see “nausea and vomiting,” R11.2 is the safer pick. However, if the note names a subtype (e.g., “projectile”), prefer the specific R11.1x code.
Third, ignoring Excludes1/Excludes2 and coding conflicts. Excludes1 at the category or subcategory level blocks dual reporting of certain combinations. Excludes2 tells you conditions are distinct and may both be coded. Skipping these notes leads to unnecessary payer edits.
Fourth, stopping at “unspecified” when the note has details. If you see the phrase “without nausea,” use R11.11, not R11.10 or R11.2. If “projectile” is in the HPI, that supports R11.12. Code to the highest supported specificity.
To prevent these errors, add three brief prompts to your note templates: “Underlying cause confirmed?” “Vomiting present?” “If vomiting, subtype?” Small prompts reduce rework and align the encounter with the final coded claim.
- Wrong: “R11.0” for “nausea and vomiting.
- Right: “R11.2” when no vomiting subtype is documented.
- Better: “R11.12” when the note says “projectile vomiting.
Tools and Resources for Accurate ICD-10 Coding
You don’t need to memorize every nuance. Instead, bookmark two official references and pair them with a smart EHR workflow for 2026.
- CDC/NCHS ICD-10-CM Browser: Search R11 fast, read definitions, and check Excludes notes and 2026 updates in one view.
- WHO: For the global classification background, the WHO’s ICD hub explains structure and change management.
- AAPC and AHIMA encoders: AAPC code lookup and AHIMA-backed encoders (named here without links) give payer-focused notes and edits that complement the official listings.
On the workflow side, tools like MedCore’s ambient SOAP scribe can pre-fill ICD-10 suggestions based on the provider’s spoken or typed HPI, then surface Excludes notes before sign-off. That feature comes from its “Ambient SOAP scribe with ICD-10 and CPT code pre-filling” engine, tied into a unified EHR. One administrator summed up the downstream impact: “Our OPD wait time dropped from 40 minutes to 12.
The live token display alone was worth the switch.”. Dr.
Because MedCore aligns with DPDP Act 2023 and supports FHIR R4 and HL7 v2 inbound, your coding data stays inside an India-resident, interoperable record. That makes audits and cross-system checks easier than hunting in inboxes and spreadsheets.
Mid-cycle payer changes happen. So, schedule a 20-minute review each quarter to update your quick-picks and scrub templates.
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Quick Reference: Nausea and Vomiting ICD-10 Code Table
Use this table during coding or audits. It covers the most-used R11 entries you’ll need during intake and follow-up. Keep in mind: code selection always follows documentation.
| Code | Descriptor | Use When the Note Says… |
|---|---|---|
| R11.0 | Nausea | “Nausea” only; no vomiting documented |
| R11.10 | Vomiting, unspecified | “Vomiting” with no subtype or qualifiers |
| R11.11 | Vomiting without nausea | “Vomiting without nausea” is explicitly stated |
| R11.12 | Projectile vomiting | “Projectile vomiting” is documented |
| R11.2 | Nausea with vomiting, unspecified | “Nausea and vomiting” with no vomiting subtype |
| R11.3 | See note | Not for cyclic vomiting in ICD-10-CM; use G43.A codes for cyclic vomiting syndrome when supported by documentation and guidelines |
Notes:
- If both nausea and a vomiting subtype are documented (for example, “nausea with projectile vomiting”), select the most specific vomiting code (R11.12) instead of R11.2.
- Do not add R11.0 when you already selected R11.2 or an R11.1x code for the same encounter unless an instruction permits it.
Practical next steps:
- Add R11.0, R11.2, R11.10, R11.11, and R11.12 to your EHR favorites.
- Bind each favorite to a one-line query prompt (cause? vomiting present? subtype?).
- Audit 10 encounters next week with “nausea” in the HPI and confirm correct code choice and sequencing.
Key Takeaways
Choosing the right nausea code is about sequence, presence of vomiting, and specificity. Your goal is simple: match the words in the note to the tightest code, then check excludes and payer rules. Spread this nausea icd-10 code complete workflow across your team so you all click the same path in the EHR.
- R11.0 is the correct code for nausea alone. If vomiting is present, look to R11.2 or a specific R11.1x subtype supported by the note.
- Do not stack R11.0 with R11.1x or R11.2 for the same visit unless guidelines allow it. Pick the single, best-fit code.
- When the note names a cause, code that first if guidelines say so (e.g., O21.- for vomiting in pregnancy; adverse effects in T45.- when applicable).
- Excludes1 means “never together”; Excludes2 means “can code both conditions if truly present.” Always check the current-year browser.
- Build a five-step pick-list into your EHR and audit 10 recent notes to harden the habit for 2026 and beyond.
, right column R11.2 and R11.1x criteria (vomiting present, subtype), with excludes notes icons and a small calendar tag "2026")
What to Do This Week
First, open five recent encounters that included nausea. Second, re-check each against this sequence: cause first, vomiting present, specificity, excludes, payer. Third, correct any codes and send one line of feedback to the provider: “If vomiting subtype is present, please name it (unspecified / without nausea / projectile).
Then, update your EHR favorites to include R11.0, R11.2, R11.10, R11.11, and R11.12. Add a three-question smart prompt to your SOAP template: “Underlying cause confirmed?” “Vomiting present?” “If yes, which subtype?
Finally, share two links on your team channel: the CDC browser page for R11 and this internal coaching article on symptom coding style. If you want a guided walk-through of coding tools that pre-fill ICD-10 from real-time notes, and keep data in India with FHIR-native records, schedule a quick session.
For more symptom-coding structure you can copy, review this related how-to: Seasonal Allergies ICD-10 Codes: A Complete Guide to Accurate Coding.
