ICD-10 code Z90.3: Acquired absence of stomach [part of]

ICD-10 code Z90.3 reports acquired absence of stomach [part of], the status code used after a total or partial gastrectomy. Coders apply it whenever a patient’s surgical history is clinically relevant to the current visit, such as a follow-up appointment, a nutrition consult, or management of a complication like dumping syndrome. It functions as a secondary code alongside whatever diagnosis explains why the patient is being seen.

Key Takeaways

ICD-10 code Z90.3 describes acquired absence of stomach [part of] and is a fully billable FY2026 diagnosis code valid for HIPAA-covered transactions from October 1, 2025 through September 30, 2026.

Z90.3 is a status code, not a primary diagnosis. Sequence it as a secondary or additional code alongside the primary reason for the encounter, such as a follow-up visit or nutritional complication.

The parent code Z90 is non-billable. Always use the specific child code Z90.3 on claims. Submitting Z90 alone will result in a rejection.

Practice management software like Pabau helps practices flag incomplete code combinations before submission, reducing denials tied to missing secondary codes like Z90.3.

Gastrectomy patients return for follow-up care for years after surgery, and every encounter needs accurate documentation of their surgical history. Miss the correct status code on a post-gastrectomy claim and you risk denials, audit flags, and incomplete patient records that downstream providers rely on.

ICD-10 code Z90.3 captures exactly that history. It is a billable, active diagnosis code that tells payers and care teams a patient has undergone a full or partial gastrectomy. This reference guide covers the code’s classification, valid use cases, sequencing rules, documentation requirements, and the related Z90 family codes coders reach for most often.

ICD-10 code Z90.3: Definition and clinical description

ICD-10 code Z90.3 has the full official description: Acquired absence of stomach [part of]. The bracketed phrase “[part of]” is significant. It signals that this single code covers both total gastrectomy (complete surgical removal of the stomach) and partial gastrectomy (removal of a portion of the stomach), with no separate child codes distinguishing between the two at this level of the ICD-10-CM hierarchy.

“Acquired” means the absence resulted from a medical or surgical procedure, not a congenital condition. The underlying cause can vary: gastric cancer, peptic ulcer disease, bariatric surgery, or traumatic injury. Sleeve gastrectomy is the bariatric procedure most often coded here, since it surgically removes a portion of the stomach.

Roux-en-Y gastric bypass is a different case. It reroutes the digestive tract rather than removing stomach tissue, so it’s coded Z98.84 (Bariatric surgery status), not Z90.3. A documented history of Billroth I (gastroduodenostomy) or Billroth II (gastrojejunostomy) reconstruction is a common clinical trigger for Z90.3, since both are partial gastrectomies performed for ulcer disease or gastric cancer.

The cause of the gastrectomy does not change the code. What matters is documenting the patient’s current anatomical status.

According to the CMS ICD-10 codes page, Z90.3 sits within Chapter 21 of the ICD-10-CM tabular list: Factors influencing health status and contact with health services (Z00-Z99). It falls under the Z77-Z99 block, covering persons with health hazards related to personal and family history.

The immediate parent category is Z90, Acquired absence of organs, not elsewhere classified. Z90 itself is a non-billable header code. Z90.3 is the billable, specific code that payers accept.

Z90 code family hierarchy

Understanding where Z90.3 sits within the Z90 family helps coders select the right sibling code when a different organ is involved. The table below shows the full Z90 group hierarchy for the digestive and adjacent organ sections most commonly encountered in clinical practice.

Notice that Z90.3 has no further sub-codes for “total” versus “partial” stomach absence, unlike the pancreas (which distinguishes Z90.410 from Z90.411). That means coders use the same ICD-10 code Z90.3 regardless of whether the patient had a sleeve gastrectomy removing a portion of the stomach or a total gastrectomy removing it entirely. The operative report and clinical documentation capture the surgical specifics; the ICD-10 code captures the resulting status.

When to use ICD-10 code Z90.3

Z90.3 belongs to the Z-code category of ICD-10-CM: status codes that describe a patient’s current condition or history rather than an active disease. That distinction drives the most important coding rule for this code.

Common encounter scenarios

Z90.3 is almost always a secondary or additional code. The primary diagnosis on the claim should reflect why the patient is being seen at this specific encounter. For example:

• A patient returning for a bariatric surgery follow-up: the primary code reflects the follow-up purpose (such as Z09, Encounter for follow-up examination after completed treatment), with Z90.3 added as a secondary code to document the gastrectomy status.
• A patient presenting with vitamin B12 deficiency after total gastrectomy: the primary code captures the nutritional deficiency (E53.8), while Z90.3 documents the underlying anatomical cause relevant to payer and care management context.
• A patient being managed for dumping syndrome post-gastrectomy: the primary code reflects dumping syndrome (K91.1, Postgastric surgery syndromes), with Z90.3 added to confirm the surgical history driving the condition.

CMS Medicare Code Edits list Z90.3 as an unacceptable principal diagnosis. The code describes a circumstance affecting a patient’s health status rather than the acute reason for the visit, so a claim listing Z90.3 as the sole first-listed diagnosis will be returned for correction.

The actual reason for the encounter, such as a follow-up visit (Z09) or a complication code, must always be sequenced first, with Z90.3 added as a secondary code.

The CDC/NCHS ICD-10-CM web tool confirms Z90.3 is valid for both FY2025 (October 1, 2024 through September 30, 2025) and FY2026 (October 1, 2025 through September 30, 2026). No changes to this code’s description or status were made in recent annual updates.

Coding guidelines for ICD-10 code Z90.3

ICD-10-CM general coding guidelines, published jointly by CMS and the National Center for Health Statistics, set out specific rules for Z codes that coders must follow to avoid claim errors.

Z-code use in outpatient vs. inpatient settings

In outpatient settings, Z90.3 is commonly used during post-surgical follow-up visits, nutrition counseling, and management of post-gastrectomy complications. In inpatient settings, it typically appears as a secondary diagnosis. It provides clinical context when the patient is admitted for a complication related to their gastrectomy history.

The ICD-10-CM official guidelines state that Z codes may be used as either a first-listed or additional diagnosis, depending on the encounter. For Z90.3, additional diagnosis placement is the standard in most settings. The absence of the stomach is a historical status: it informs the reason for the visit but does not define it.

Excludes notes for Z90.3

According to the official ICD-10-CM tabular list, Z90.3 carries no Excludes1 or Excludes2 notes at the code level itself. However, the parent category Z90 includes an Excludes2 note pointing to postprocedural absence codes in the E89 category (Postprocedural endocrine and metabolic complications and disorders).

This means codes such as E89.1 (Postprocedural hypoinsulinemia) or E89.2 (Postprocedural hypoparathyroidism) can be coded alongside Z90 codes when both conditions are present and clinically relevant. The Excludes2 note signals “not included here” rather than “cannot code together,” so dual-coding is appropriate when documentation supports it.

ICD-10-CM vs. WHO ICD-10

The U.S. Clinical Modification (ICD-10-CM) and the WHO’s international ICD-10 edition are related but not identical systems. In the WHO ICD-10 browser, the equivalent entry appears under Z90.3 as “Acquired absence of part of stomach.” The description wording is slightly different from the ICD-10-CM version.

For U.S. billing and HIPAA-covered transactions, always use the ICD-10-CM version maintained by CMS and NCHS, not the WHO classification directly. Non-U.S. providers should verify the applicable national adaptation.

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Related codes and the Z90 adjacent family

Post-gastrectomy patients generate a range of associated codes across their care journey. The table below maps the most commonly paired diagnosis codes alongside ICD-10 code Z90.3 in clinical practice.

Practices managing bariatric and oncologic gastrectomy follow-up populations will encounter these code combinations frequently. Using consistent weight loss clinic software can help teams track which secondary codes belong in each patient’s recurring visit profile.

When the gastrectomy was performed as a bypass rather than a resection, coders should reference CPT 43644 for the procedure itself and Z98.84 for the resulting status, instead of Z90.3.

For a broader lookup of the Z90 code family, the AAPC Codify ICD-10-CM lookup and icd10data.com both provide free searchable access to the full ICD-10-CM tabular, including parent/child code relationships and any applicable notes.

Documentation requirements and claim submission for Z90.3

Accurate documentation is the foundation of a defensible Z90.3 code assignment. Payers auditing post-gastrectomy claims expect the medical record to clearly support the coded status. These are the documentation elements coders should look for before assigning ICD-10 code Z90.3.

Required documentation elements

• Operative report or surgical history note confirming a gastrectomy was performed, with a date (even approximate) and the extent of resection (total or partial).
• Attending physician documentation in the current encounter note referencing the patient’s gastrectomy status as clinically relevant to the current visit. A vague “history of surgery” entry is not sufficient on its own.
• Link between the gastrectomy status and the current encounter. If Z90.3 is coded as additional, the primary diagnosis should have a clinically logical relationship to the stomach absence (for example, a nutritional deficiency or dumping syndrome that arose from the procedure).
• Specificity of extent is not required by the ICD-10-CM code itself, since Z90.3 covers both partial and total gastrectomy. Even so, operative reports that detail the extent of resection protect the practice during audit and support thorough patient record documentation.

Claim submission considerations

Z90.3 is compatible with most evaluation and management (E&M) service codes and procedure codes used in post-surgical follow-up care. The code does not carry a specific MUE (medically unlikely edit) restriction at the code level. However, payer-specific LCD (local coverage determination) policies may apply to services rendered to post-gastrectomy patients, particularly for parenteral nutrition, vitamin supplementation, or claims billed under CPT 97802.

Practices submitting claims involving Z90.3 should verify that:

• The code is listed in the secondary diagnosis field, not the primary diagnosis field, unless the encounter is purely for management of the patient’s gastrectomy status with no other diagnosis driving care.
• The primary diagnosis selected has an established clinical relationship to the absence of stomach, or clearly documents the reason for the current encounter independent of the gastrectomy status.
• Supporting documentation is retained in the EHR in a format that can be produced in the event of a payer audit. Practices using compliance management tools can establish internal audit workflows that catch Z90.3 misuse before claims reach the payer.

For clinics managing patients with complex surgical histories, structured digital intake forms make it easier to capture and carry forward the gastrectomy status across recurring encounters. This reduces the risk of the code being omitted on subsequent claims.

Coding Z90.3 consistently also supports population health analytics and quality reporting, particularly for practices in value-based care programs. Practices monitoring nutritional complications, such as the B12 and iron deficiencies common after gastrectomy, can also lean on metabolic health workflows to keep recurring lab and supplementation follow-ups on track.

Practices focused on HIPAA-compliant billing should ensure diagnosis code assignment is tied directly to the encounter note, not applied as a standing order. The HIPAA compliance guide covers compliant workflow best practices. For post-surgical care, prescription management software can track supplementation regimens such as B12 injections. This keeps all clinically relevant information within the same patient record.

For those building out patient care protocols that extend beyond the claim itself, the broader framework of patient care management provides useful context on how to structure recurring follow-up workflows for surgically altered patients.

Conclusion

Post-gastrectomy patients are long-term care relationships. Accurate, consistent use of ICD-10 code Z90.3 protects claim integrity and supports downstream providers. It also ensures the patient’s anatomical status is visible in every encounter record.

The most common errors are using the non-billable parent Z90, placing Z90.3 as the primary diagnosis when a complication code should lead, or omitting it from follow-up encounters where it is clinically relevant.

Pabau’s claims management software helps practices build code-combination rules that catch these issues before submission, keeping denial rates low and audit risk lower. To see how Pabau supports post-surgical care documentation workflows, book a demo with the team.

Continue your research

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