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Medical Coding (ICD-10, CPT, & Modifiers)
Plain-English guides to ICD-10, CPT and HCPCS coding, modifiers, and the payer rules that decide whether a claim pays. Written for practice managers, coders and billers.
102 guides
Modifier 52 (Reduced Services): When to Use It vs Modifier 53
Modifier 52 reports a service the provider chose to reduce. Learn when it fits, how it differs from 53, 73 and 74, and what payers expect on the claim.
Moderate Sedation CPT Codes 99151-99157: Time and Age Rules
Which moderate sedation code goes on the claim? Age, who gives the sedation and documented minutes decide it. Here are the rules, the time bands and the checks that prevent...
Medical Coding Audit: Types, Sample Size and Process
Which type of medical coding audit to run, how many charts to sample, who should review them and what to do when the audit finds an overpayment.
Insomnia ICD-10 Codes: G47.00, G47.01, G47.09 and F51.0x
Which insomnia ICD-10 codes are valid for claims, how G47.0x differs from F51.0x, and what the Excludes2 notes really allow.
ICD-10 Codes for Mental Health: FY2027 Diagnosis Guide
A sourced FY2027 map of ICD-10 codes for mental health: example F codes, how specific a diagnosis must be, and the old cheat-sheet errors to retire.
Hypothyroidism ICD-10 Codes: E03.9, E03.8 and E89.0 Explained
Which hypothyroidism ICD-10 code fits, when E03.9 is not enough, and what E89.0 and the Excludes1 notes mean for your claims. Checked against the FY2027 code set.
ICD-10 Codes for Back Pain: M54.9, M54.50 and Sciatica
Which ICD-10 code fits back pain, low back pain or sciatica? A plain guide to M54.9, M54.50, M54.51, M54.59 and the Excludes1 rules that decide which codes can share a...
ICD-10 Code for Leukocytosis: D72.829 and When to Use It
D72.829 is the ICD-10-CM code for leukocytosis when no type or cause is documented. See the D72.82x family, the Excludes notes and what the chart must show.
Hyperlipidemia ICD-10 Codes: E78.5 and When to Use Others
Which hyperlipidemia ICD-10 code fits, when E78.5 is only the fallback, and which Excludes notes matter for your claims. Checked against the FY2027 code set.
Headache ICD-10 Code: R51.9, R51.0 and Migraine Codes
R51 alone is no longer billable. See which headache ICD-10 code to use, how migraine, tension-type and cluster codes differ, and what documentation backs each one.
Follow-Up ICD-10 Codes: Z09, Z08 and Aftercare Codes Explained
Which ICD-10-CM code goes on a follow-up visit after treatment is finished? Z09, Z08 and the aftercare codes compared, plus how hospital follow-up visits are billed.
Dog Bite ICD-10 Codes: W54.0XXA and Injury Codes
Which dog bite ICD-10 codes to report, why W54.0XXA is never enough on its own, and how injury severity, infection and rabies exposure change the claim.
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