ICD-10 & ICD-11 Coding Tips to Maximize Practice Reimbursements

Medical coding is one of those things that gets treated as purely administrative until the EOBs start coming back with denials. Then suddenly everyone has opinions about what went wrong.

But here’s the more useful framing: accurate, specific medical coding is one of the highest-leverage activities in your revenue cycle. It’s not just about avoiding errors. It’s about documenting and billing for the full complexity of care you actually delivered — and making sure every legitimate dollar comes back to your practice.

This guide covers the ICD-10 coding practices that consistently move the needle, plus what you should already be thinking about as the US eventually moves toward ICD-11.

72,000+ ICD-10-CM diagnosis codes available

87,000+ Codes in ICD-11 (global implementation)

$35B Annual underpayments from coding errors (US)

62% Claim denials attributable to inaccurate coding

ICD-10: Making the System Work for You

The ICD-10-CM system was built for specificity. That’s its core design principle. With over 72,000 diagnosis codes, there’s almost always a more specific option available than whatever unspecified code gets defaulted to when documentation is thin.

The practices that get the most out of ICD-10 aren’t the ones with the most sophisticated billing software. They’re the ones with the best documentation habits and the sharpest coding team.

Seven Coding Practices That Make a Measurable Difference

1. Always Code to the Highest Specificity Available

‘Diabetes mellitus, unspecified’ (E11.9) and ‘Type 2 diabetes mellitus with diabetic chronic kidney disease, stage 3’ (E11.65) both describe diabetic patients. But they tell very different clinical stories, carry different complexity weights, and affect your reimbursement and quality metrics in very different ways. If your documentation supports specificity — use it.

2. Code Every Documented Comorbidity

Any chronic or acute condition that’s documented as being managed, evaluated, or monitored during an encounter should be coded. This isn’t upcoding — it’s accurate capture of clinical complexity. Each additional coded comorbidity contributes to E/M code support and, in risk-adjusted models, HCC capture.

3. Don’t Skip Laterality

ICD-10 requires you to specify right, left, or bilateral for many conditions. Defaulting to ‘unspecified’ when you actually documented laterality triggers code edits and sometimes denials. Train your coders to look for laterality in the clinical note before choosing an unspecified code.

4. Get Sequencing Right

The principal diagnosis goes first. This sounds obvious, but it’s one of the most common coding errors in inpatient settings — and it matters enormously. Incorrect sequencing can shift the DRG assignment, sometimes by thousands of dollars per case. In outpatient settings, the condition chiefly responsible for the visit should anchor your code list.

5. Document and Code Acute-on-Chronic Conditions Fully

A patient with chronic heart failure presenting with an acute exacerbation should be coded as ‘acute-on-chronic systolic heart failure’ (I50.23), not simply ‘heart failure, unspecified’ (I50.9). These aren’t pedantic distinctions — they carry different reimbursement weights and tell a genuinely different clinical story.

6. Update Your Code Lists Every October 1

ICD-10 codes are updated annually on October 1. New codes are added, existing codes are revised, and some are retired. Claims submitted with expired codes get rejected automatically — not reviewed and questioned, just rejected. Every October, your billing team should receive updated code lists and your EHR should be updated accordingly.

7. Never Use Unspecified When Documentation Supports Specificity

This is worth repeating because it’s the most consistent revenue leak we see. Before defaulting to an unspecified code, look at the documentation one more time. Is the type of anemia actually mentioned somewhere in the note? Is the diabetes complication documented but just not coded? More often than not, the specificity is there — it just requires one extra step to find and use it.

‘We did a retrospective audit of six months of coding and found we were leaving an average of $220 per encounter on the table through unspecified codes alone. Not fraud. Not errors. Just specificity we weren’t capturing. That’s fixed now.’ — Billing Director, 12-Physician Internal Medicine Practice

ICD-11 Is Coming — Here’s What to Know Now

The World Health Organization fully implemented ICD-11 globally in 2022. The US has not yet set a transition date from ICD-10, but healthcare organizations that wait for the announcement to start preparing will find themselves behind.

What changes with ICD-11:

• A modernized code structure with extension codes for greater granularity
• Postcoordination — combining code elements to capture complex clinical scenarios more precisely
• Better integration with SNOMED CT and other clinical terminology systems
• More comprehensive representation of rare diseases and emerging clinical conditions

None of these changes are small. Organizations that begin familiarizing their clinical and coding teams with ICD-11 concepts now will be considerably better positioned whenever the US transition is announced.

AB7 Solutions: Expert Coding for Every Encounter

Augmentive Business 7 Solutions Pvt Ltd employs CPC-certified coders with deep specialty expertise and a genuine commitment to keeping current. Every October 1 update gets built into training and systems immediately. Every denied claim gets a proper appeal. And every ICD-11 development gets tracked so AB7’s clients aren’t caught off guard by the eventual US transition.

• Specialty coding expertise across 30+ medical and surgical fields
• Annual ICD-10 update training completed every October before claims go live
• Denial management and appeals on every underpaid or rejected claim
• ICD-11 readiness planning available now for forward-looking practices

Want to take documentation off your plate completely? Augmentive Business 7 Solutions Pvt Ltd We handle Medical Scribing, Billing & Coding, EHR Documentation, Clinical Documentation and Medical Transcription — so you can focus on your patients. Call: +1 321 341 7733  |  Email: ashok.benial@ab7solutions.com Schedule a Free Call  |  www.ab7solutions.com Fill the client form on our website and one of our team members will reach you within 24 hours.

Augmentive Business 7 Solutions Pvt Ltd  |  +1 321 341 7733  |  ab7solutions.com