The denials that drain a practice are specialty-specific. Radiofrequency ablation fails for missing relief percentages from the diagnostic blocks. Behavioral health fails on units and place of service. Each page below lists the denial reasons that cost that specialty the most, and what a seat does about them.
Pick yours. If it is not listed, the work is the same and the payer rules are what change, so ask.
Facet joint injections, medial branch blocks, radiofrequency ablation and spinal cord stimulator trials carry some of the heaviest prior-authorization and documentation load in medicine.
Top denial: RFA denied because the chart does not carry percent relief and duration from both diagnostic blocks
Anesthesia billing is time units plus base units plus modifiers, and a single missed start or stop time changes the whole claim.
Top denial: Time units miscalculated from an incomplete anesthesia record
Global periods, modifier 25 and 59 scrutiny, and implant billing make orthopedics one of the most audited specialties.
Top denial: Modifier 25 denied on an E/M billed the same day as a procedure
ASCs live and die on the payable-procedure list, implant carve-outs and multiple-procedure reductions.
Top denial: Procedure not on the ASC covered list for that payer
Time-based codes, telehealth place-of-service and authorization limits make behavioral health uniquely denial-prone.
Top denial: Time-based psychotherapy codes not supported by documented duration
Diagnostic testing, device checks and the professional/technical split create constant component-billing errors.
Top denial: Professional and technical components split incorrectly (26 / TC)
Screening versus diagnostic colonoscopy is in our experience the most common and most expensive coding decision in GI.
Top denial: Screening colonoscopy converted to diagnostic without modifier PT or 33
Lesion destruction, excision sizing and Mohs staging make dermatology heavily documented and heavily audited.
Top denial: Excision size documented after closure rather than before
In-office procedures, drug administration and global periods create a dense mix of professional and supply billing.
Top denial: In-office procedure denied for place-of-service mismatch
Routine foot care exclusions and systemic-condition documentation drive most podiatry denials.
Top denial: Routine foot care denied without a qualifying systemic diagnosis
Timed versus untimed units and the therapy threshold make PT billing a units problem before it is a coding problem.
Top denial: Timed code units not supported by documented treatment minutes
Component billing, prior authorization for advanced imaging, and appropriate-use criteria shape the whole revenue cycle.
Top denial: Advanced imaging denied for missing prior authorization
Ophthalmology bills into two systems at once — the vision plan and the medical carrier — while the surgical side runs on cataract extraction with lens implants, intravitreal injections, laser capsulotomy and glaucoma lasers and stents. Laterality sits on nearly every line, surgical work carries a global period, and retina adds a buy-and-bill drug — any one can sink the claim.
Top denial: Second-eye cataract surgery denied as a duplicate of the first because the claim carried the wrong eye on the laterality modifier, or went out without one at all.
Otolaryngology runs office endoscopy, audiology and operating-room work off one schedule — nasal endoscopy, laryngoscopy and tympanostomy tubes alongside sinus surgery, septoplasty and tonsillectomy. Most of that sits inside payer medical policy, so payment turns less on the operation itself than on what the chart proves about failed treatment, imaging and laterality.
Top denial: Endoscopic sinus surgery denied because the chart never pulls the failed medical management together — the drug trials, their dates and imaging findings sit in separate notes or nowhere.
Neurology billing runs on far more than the office visit. Routine and long-term video EEG, nerve conduction studies with needle EMG, botulinum toxin for chronic migraine and infused therapies for MS and neuromuscular disease each carry their own authorization path, supervision rule and documentation standard — and each fails in its own way.
Top denial: Nerve conduction study with needle EMG denied because the report gives only a summary impression instead of each nerve and muscle tested with its findings
OB/GYN runs two revenue cycles at once. Maternity is a global package: months of antepartum visits, the delivery and postpartum care bundled into one claim filed after the birth. The gynecology side bills procedure by procedure — colposcopy, LEEP, ablation, hysteroscopy, laparoscopic hysterectomy. A mistake at the first prenatal visit surfaces only when the delivery claim goes out months later.
Top denial: Global maternity package billed in full after the patient transferred care mid-pregnancy, when only the antepartum visits actually rendered here should have been itemised.
Urgent care is walk-in evaluation and management at volume, plus laceration repair, splinting, incision and drainage, foreign body removal, in-house X-ray and rapid testing. Patients arrive without appointments, many of them new to the centre, so coverage is captured at the desk under pressure and there is no scheduled window in which to check it before the visit.
Top denial: Coverage taken from whatever card the walk-in hands over at the desk and never checked against the plan, so the claim goes to a policy the patient left months ago
Primary care runs on volume — wellness and preventive visits, same-day acute complaints, chronic disease follow-up, immunisations, in-office labs and care management between visits. Individual claims are small, many carry several separately payable lines, and one encounter often mixes preventive work with problem work, so revenue leaks in ones and twos rather than in one large denial.
Top denial: A preventive visit and a same-day problem visit written up in one undivided note, so the problem visit bundles into the wellness visit and is not paid separately.
Nephrology bills the month, not the visit. The monthly dialysis management service is one claim per patient per month, and what it is worth depends on where the patient was treated, how many face-to-face visits are documented, and how many days of the month the practice actually managed that patient. It gets reconciled against the unit's treatment log before it goes out.
Top denial: Monthly dialysis management billed at a visit tier the flowsheets do not support, because nobody counted the documented face-to-face visits before the claim went out
Rheumatology combines long evaluation visits for complex autoimmune disease with an in-office infusion suite, joint aspirations and injections, ultrasound guidance and bone density testing. The biologics are the hard part: the practice buys the drug, stocks it, infuses it and bills it, so one authorization or documentation gap costs the drug as well as the claim.
Top denial: Biologic denied on step therapy because the chart never records which conventional DMARDs were tried, at what dose, for how long, and why each was stopped.
Medical oncology bills a treatment plan, not a visit: infusions, sequential and concurrent administrations, hydration, injections, and the drug itself, which the practice buys up front and is reimbursed for only once the claim clears. The money sits in the drug, so one unit conversion error or one lapsed authorization can cost more than a full day of office visits.
Top denial: Infusion start and stop times missing from the nursing record, so the initial, sequential and concurrent hierarchy cannot be supported and the extra administrations fall off the claim.
Wound care runs on debridement, skin substitute application, compression for venous ulcers and hyperbaric therapy, and the claim is built out of what the note records: the tissue removed, the measurements taken, the product used. The same wound is billed visit after visit for months, so each claim has to show what changed since the last one.
Top denial: Debridement billed at a depth the note does not support, because the description names slough and fibrin rather than the deepest tissue actually removed
Attended polysomnography, home sleep testing, PAP titration and the interpretation that follows are only half the work. The same patient then produces a device claim and a monthly supply claim, often sitting under a separate benefit, a separate authorization and a separate supplier network.
Top denial: In-lab polysomnography denied because the chart never records why a home sleep test was unsuitable for this patient
Chiropractic revenue turns on high-frequency, low-dollar visits: spinal and extraspinal manipulation, the initial exam, re-evaluations and the therapy billed around them. The code set is narrow. The money is lost in documentation and in benefit limits, because plans cap visits and separate active treatment from maintenance, and the note has to carry that distinction every visit.
Top denial: Manipulation billed for more spinal regions than the day's note supports, with the regions adjusted listed but the findings behind each one absent
Pediatrics runs on well-child visits, immunisations and a vaccine inventory that is half purchased and half supplied by a federal programme — and the two are billed completely differently.
Top denial: Vaccine administration billed without the matching product code, or the reverse
Laboratory billing turns on medical necessity for the ordering diagnosis, panel-versus-component rules, and who is permitted to bill for the interpretation.
Top denial: Panel components billed separately when the payer pays the panel code
Durable medical equipment is documentation billing: the order, the face-to-face, the medical necessity and the delivery all have to exist before the claim does.
Top denial: Missing or non-compliant written order prior to delivery
Allergy practices bill testing and immunotherapy against strict unit and frequency rules, and the antigen preparation is billed separately from its administration.
Top denial: Percutaneous and intradermal test units exceeding the payer's per-session limit
Hospitalist billing is inpatient E/M under time and medical decision making, and most of what goes wrong is two physicians billing the same patient on the same day.
Top denial: Duplicate same-day E/M with another physician of the same specialty and group
Every claim here answers one question first: was this reconstructive or cosmetic. The documentation that settles it has to exist before the operation, not after the denial.
Top denial: Functional impairment not documented, so a reconstructive procedure is read as cosmetic
An FQHC is not paid fee-for-service. It is paid an encounter rate under a prospective payment system, and applying a commercial billing workflow to it produces denials and programme problems together.
Top denial: Encounter-rate claim billed as fee-for-service, or a wrap-around payment never pursued
RHCs bill an all-inclusive rate rather than a fee schedule, and the commonest loss is a practice billing them like an ordinary clinic and never noticing the difference.
Top denial: Visits billed fee-for-service instead of under the all-inclusive rate
Geriatrics carries chronic care management, annual wellness visits, advance care planning and transitional care — services with real revenue and unusually specific documentation and timing rules.
Top denial: Chronic care management billed without the documented time or the required consent
Infectious disease is consultation-heavy and drug-heavy: long courses of expensive therapy, each carrying its own authorization and its own reauthorisation nobody is counting.
Top denial: Specialty drug authorization lapsing mid-course, so later infusions deny
Pulmonology splits between office testing with its own component rules and critical care billed by time, and the two are audited for completely different things.
Top denial: Pulmonary function tests billed with technical and professional components reversed
Endocrinology lives on continuous glucose monitors, insulin pumps and diabetes education — three benefit categories with different rules, and often three different places a claim can be sent.
Top denial: Continuous glucose monitor denied for coverage criteria the chart does not evidence
Vascular work concentrates money in a small number of large claims, and the two things that decide payment are the imaging that justified the intervention and the modifiers on the intervention itself.
Top denial: Endovascular procedures denied for medical necessity criteria in the coverage policy
Occupational medicine barely touches health insurance. It bills employers, workers' compensation carriers and state fee schedules — three payers whose rules have nothing to do with commercial billing.
Top denial: Workers' compensation claims worked as commercial claims and denied on the wrong basis
Home health and hospice are paid in episodes and periods, not per visit, and almost everything that goes wrong is a certification or a date that was not obtained in time.
Top denial: Face-to-face encounter not documented inside the certification window
Substance use treatment carries the heaviest confidentiality rules in US healthcare and the tightest authorization cycles — levels of care are reauthorised continuously and lapse quietly.
Top denial: Level-of-care authorization lapsing between reviews, so days deny retroactively
Cardiothoracic claims are few, large and heavily scrutinised. Assistant surgeons, co-surgeons and global periods account for most of what is lost.
Top denial: Assistant-at-surgery denied because the payer does not allow one for that procedure
General surgery is a modifier specialty. Global periods, staged procedures, unrelated visits and multiple procedures decide most of what pays and most of what does not.
Top denial: Modifier 25 denied on an E/M billed the same day as a minor procedure
Emergency medicine bills patients it will never see again, for care nobody authorized, to plans it usually has no contract with — which makes eligibility, level of service and out-of-network the three fault lines.
Top denial: Eligibility unknown at the time of service, so the claim goes to the wrong payer or none
These practices mix covered medical services with services no plan covers, and the commonest failure is billing the two the same way — which is both a denial and a compliance exposure.
Top denial: Non-covered services billed to insurance rather than collected as cash
Internal medicine carries the widest range of anything on this list — chronic disease, preventive care, procedures in the room — and the losses are spread thinly across all of it rather than concentrated.
Top denial: Preventive and problem-focused visits billed on the same day without modifier 25
Family practice sees every age group under one roof, which means paediatric vaccine rules, adult preventive schedules and geriatric wellness rules all apply in the same clinic on the same day.
Top denial: Vaccine administration and product codes mismatched across age groups
Some dental procedures are payable by medical plans, and the practice that never bills them loses the revenue entirely. The work is knowing which ones, and proving medical necessity to a plan that does not think of itself as dental.
Top denial: Medically necessary dental procedures billed only to the dental plan, or not at all
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