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Gastroenterology Coding Alert


Get The Lowdown on These Diagnoses Commonly Seen in the ASC

From upper GI to colonoscopy, know which codes to report.

Just like when you perform services in the office, handling procedures in the ASC requires accurate diagnosis coding. Insurers expect you to justify the medical necessity of every service you perform, and the easiest way to do that is to assign the right ICD-10 codes to your claims.

Consider the following best practices when you report diagnosis codes for these conditions, which are commonly seen in the ASC.

Screening Colonoscopy? Check These Diagnoses

If you see a patient in the ASC for a screening colonoscopy, you should report Z12.11 (Encounter for screening for malignant neoplasm of colon) on your claim. However, keep in mind that if the physician initially intends to perform a screening service but ends up finding something such as a polyp that creates a diagnostic service, a second code will be required.

You need to be accurate on sequencing ICD-10 codes for a screening colonoscopy that ends up therapeutic, and would report the claim as follows:

  • Report the screening ICD-10 CM code Z12.11 listed first on the claim, and
  • Next, report the adenoma/polyp ICD-10 CM code based on the exact nature and site of polyp.

If, however, you’re performing a diagnostic colonoscopy from the start, you’ll report a definitive diagnosis when your gastroenterologist has performed a procedure and the results confirm the condition.

Example:  The gastroenterologist conducts a colonoscopy and confirms a diagnosis of Crohn’s disease with rectal bleeding. In this case, you should report K50.911 (Crohn’s disease, unspecified, with rectal bleeding) as the primary diagnosis for the colonoscopy.

However, if your gastroenterologist performs a procedure and the evidence is inconclusive, you should fall back on signs and symptoms. For instance, if, during the colonoscopy, the gastroenterologists finds results negative for Crohn’s disease, you should rely only on the signs and symptoms to establish medical necessity for services the doctor provides.

Assign These Common Upper GI Findings With Ease

Physicians typically perform upper GI services to diagnose conditions after patients complain of symptoms. In some cases, the gastroenterologist will have a diagnosis in mind, but it’s important to never report suspected or rule-out diagnoses on claims. Instead, you’ll submit a claim using the final diagnosis (when applicable), or the signs and symptoms (when no diagnosis is confirmed).

For instance, suppose the GI physician performs an upper GI because he suspects that the patient is suffering from Barrett’s esophagus, but the doctor ultimately finds a gastric ulcer that he attributes to the patient’s long-term use of ibuprofen. The physician does not confirm Barrett’s esophagus.

In this situation, you’ll report the primary diagnosis with K25.9 (Gastric ulcer, unspecified as acute or chronic, without hemorrhage or perforation). In addition, you should add Z79.1 (Long-term [current] use of non-steroidal anti-inflammatories [NSAID]) as your secondary diagnosis.

Know When Signs, Symptoms Are the Best

In the absence of a definitive diagnosis, you should report signs and symptoms to support medical necessity for services your gastroenterologist provides, in situations such as the following:

  • The physician cannot make a more specific diagnosis, even after he has investigated all the facts bearing on the case.
  • Signs or symptoms existing at the time of the initial encounter that proved to be transient and whose causes could not be determined.
  • Provisional diagnoses in a patient who failed to return for further investigation or care.
  • Cases referred elsewhere for investigation or treatment before the physician could make a diagnosis.
  • Cases in which a more precise diagnosis was not available for any other reason.
  • Certain symptoms that represent important problems in medical care and that the physician might wish to classify in addition to a known cause.

Some signs and symptoms you might see in a gastro­enterologist’s documentation include upper abdominal pain (such as R10.10), diarrhea (R19.7), flatulence (R14.3), gas pain (R14.1), nausea (R11.0), and nausea with vomiting (R11.2).