The Right ICD-10 Code Is the Difference Between Paid and Denied
One wrong digit in a diagnosis code can trigger a denial, an audit flag, or a payment reduction — and the provider never even knows why. Theiatrics puts AAPC-certified coders on your claims so that every diagnosis, every procedure, and every modifier is assigned correctly the first time.
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A Single Wrong Code
Costs More Than You Think
Medical coding sits right in the middle of your revenue cycle. Every claim that leaves your practice has to answer one question from the payer: does this diagnosis justify this procedure? If the codes say yes clearly and specifically, the claim pays. If they don't, it doesn't.
The problem most practices face isn't that their coders don't care — it's that medical coding is genuinely complex. ICD-10-CM alone contains over 70,000 codes, updated annually. The rules for specificity, sequencing, laterality, and combination codes vary by payer and change every October. Using the wrong level of a code, forgetting a secondary diagnosis, or choosing a code that doesn't map to the procedure being billed — any of these can sink a claim that should have been paid without question.
And the damage goes both ways. Undercoding means your practice collects less than it earned. Overcoding without documentation creates compliance risk. Theiatrics walks the line correctly — maximum compliant reimbursement, every time.
Studies estimate that up to 80% of medical bills contain at least one error, and coding mistakes are among the leading causes. The majority of these errors are preventable with trained, certified coders reviewing every claim before submission.
What We Code
Every Code Type, Handled by Certified Specialists
ICD-10 is just one part of a complete coding picture. Our team handles every code type needed for accurate, complete claim submission.
ICD-10-CM Diagnosis Coding
We assign the most specific, accurate ICD-10-CM diagnosis codes based on physician documentation — including primary diagnoses, secondary conditions, comorbidities, and symptom codes where applicable. Proper sequencing and specificity are the foundation of every clean claim.
CPT Procedure Coding
Current Procedural Terminology codes describe exactly what was done during the visit or procedure. We select the correct CPT code — including any required add-on codes — based on the services documented, ensuring you're reimbursed for every billable component of the encounter.
Evaluation & Management Coding
E/M level selection is one of the most scrutinized areas in medical coding. Get it wrong and you're either leaving money on the table or creating audit exposure. Our coders apply the 2023 AMA E/M guidelines rigorously — selecting the level that is supported by the documentation, nothing more and nothing less.
Modifier Assignment
Modifiers communicate important context to payers — whether a service was bilateral, performed by a separate provider, bundled with another procedure, or distinct from a concurrent service. Missing or incorrect modifiers are a leading cause of avoidable denials that our coders catch before the claim goes out.
ICD-10-PCS Inpatient Coding
For hospital inpatient claims, ICD-10-PCS replaces CPT for procedure coding. PCS uses a seven-character alphanumeric structure with its own classification logic — completely separate from outpatient coding rules. Our coders handle both systems so nothing gets coded in the wrong framework.
Coding Audits & Reviews
We conduct prospective audits (before claims go out) and retrospective audits (on historical claims) to identify coding patterns, flag errors, check compliance with payer-specific guidelines, and surface undercoding that is costing your practice revenue it should be collecting.
What We Prevent
The Coding Errors That Cost Practices the Most
These are the most frequent and costly coding mistakes we find when we audit a practice's existing claims — and fix before they cause another denial.
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Coding to an Unspecified Level
Using a non-specific code when a more detailed one exists — for example, "fracture, unspecified" instead of the laterality-specific, encounter-specific version. Many payers auto-deny unspecified codes when documentation supports specificity.
Our coders always code to the highest documented level -
Diagnosis and Procedure Code Mismatch
Submitting a procedure code that payers don't recognize as medically necessary for the accompanying diagnosis. This is one of the most common and entirely preventable denial reasons — caught every time during our pre-submission review.
Every code pair validated before submission -
Missing Secondary or Comorbid Diagnoses
Leaving out a related condition can affect reimbursement level and medical necessity support. For some payers, additional diagnoses directly impact DRG assignment for inpatient claims, making complete coding critical to payment accuracy.
Full documentation review captures all relevant conditions -
Using Deleted or Outdated Codes
ICD-10 is updated every October. Codes that were valid last year may be deleted, revised, or replaced. Claims submitted with an invalidated code are rejected automatically — and this happens more often than practices realize after each annual update.
Code set updated annually before Oct 1 effective date -
Incorrect E/M Level Selection
Selecting a lower complexity E/M code than the documentation supports is the most common form of undercoding. Over a year of patient visits, this gap between the E/M level billed and the level the documentation actually supports adds up to thousands of dollars in unrealized revenue.
E/M level matched to 2023 AMA guidelines every visit -
Unbundling Codes Incorrectly
Billing separately for services that payers expect to be bundled — or failing to use the appropriate modifier when separate billing is actually justified — leads to either denials or compliance risk. Our coders understand bundling rules by payer and apply them consistently.
Bundling rules reviewed per payer before submission
Who Is Coding Your Claims
Theiatrics does not assign coding to generalist billing staff. Every claim is reviewed by a coder with credentials, specialty training, and an ongoing commitment to staying current with annual guideline changes.
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AAPC-Certified Professional Coders
CPC credential — the industry standard for outpatient and physician coding.
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Specialty-Specific Training
Coders assigned by specialty — cardiology claims go to a cardiology coder, not a generalist.
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Ongoing CEU Requirements
Certification requires continuing education units — our coders stay current on guidelines year-round.
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Pre-Submission QA Review
Every coded claim goes through a quality check before it reaches the payer — not after it comes back denied.
Annual Update Ready
Each October, ICD-10-CM adds, revises, and deletes codes. Theiatrics updates internal coding references before the effective date so your claims never get rejected for using a code that no longer exists.
Specialty-Specific Coding
Coding Rules Vary Significantly by Specialty
A cardiologist's claim looks nothing like an anesthesiologist's. Each specialty has its own code families, payer policies, documentation requirements, and common denial patterns. Our coders are trained by specialty — not just by code set.
Cardiology
Complex procedure hierarchies, echocardiography bundling rules, and cardiac catheterization code sequences require coders who know the specialty deeply.
Gastroenterology
Endoscopy coding, colonoscopy with and without biopsy, upper GI procedures — each requires precise CPT selection and modifier awareness to avoid bundling denials.
Anesthesia
Anesthesia billing uses a unique unit-based system with base units, time units, and qualifying circumstances — completely different from standard CPT billing logic.
Neurology
Neurological coding requires precision on laterality, acuity, and episode codes — and EEG/nerve conduction study codes have strict payer-specific medical necessity requirements.
Mental Health
Behavioral health coding requires careful handling of time-based psychotherapy codes, E/M-plus-therapy combinations, and modifier use for telehealth sessions.
Orthopedics
Orthopedic procedures involve precise laterality, fracture type, displacement status, and encounter type coding — all of which directly affect reimbursement and payer acceptance.
OB/GYN
Obstetric global packages, delivery coding, and trimester-specific diagnosis sequencing are all areas where specialty coding experience makes a measurable difference in collections.
Radiology
Radiology coding involves technical versus professional component splits, imaging modality specifics, and contrast versus non-contrast distinctions that affect how claims pay.
Oncology
Chemotherapy administration, infusion, telehealth, and cancer staging codes require coders who understand how oncology claims are built, sequenced, and reviewed by payers.
How We Work
Our ICD-10 Coding Process
Accurate coding doesn't happen by chance. It follows a repeatable process that keeps quality consistent across every claim, every provider, and every specialty.
Documentation Review
Our coders review the physician's documentation — visit notes, procedure reports, and any supporting records — before assigning a single code. You cannot code what isn't documented, and you shouldn't code less than what is.
Diagnosis Code Assignment
We assign ICD-10-CM codes in the correct sequencing order — primary diagnosis first, followed by secondary conditions, comorbidities, and any relevant symptom or external cause codes required by the payer or code guidelines.
Procedure Code and E/M Selection
CPT codes and the appropriate E/M level are selected based on what was actually performed and documented. We verify that every CPT code has a supporting diagnosis and that the E/M level reflects the documented complexity of the encounter.
Modifier Review and Application
We review each claim for modifier requirements — bilateral procedures, distinct procedural services, assistant surgeon roles, professional and technical component splits, and any other scenario where the payer needs additional context to process the claim correctly.
Pre-Submission Quality Check
Before the coded claim goes to billing, it goes through our internal QA process. Code pairs are validated against payer-specific medical necessity rules, bundling edits are checked, and completeness is confirmed. Problems are caught here — not in the denial queue.
Coder Feedback and Documentation Queries
When documentation is unclear or insufficient to support the highest appropriate code, we flag it with a query to the provider. This collaborative approach improves documentation quality over time and reduces the volume of incomplete claims going forward.
Every Claim Starts with the Right Code
Accurate ICD-10 coding is the foundation of every paid claim. Let Theiatrics' certified coders handle it — so your practice collects the full, compliant reimbursement it earned on every single encounter.
Get Your Free Coding AssessmentEverything You Should Know About Professional ICD-10 Coding Services
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