Changes in Patient Visits and Diagnoses seen in an Academic Ophthalmology Department during the COVID-19 pandemic

BACKGROUND: To minimize the risk of viral transmission, ophthalmology practices limited face to face encounters to only patients with urgent and emergent ophthalmic conditions, in the weeks after the start of the COVID-19 epidemic in the United States. The impact of this is unknown. METHODS: We did a retrospective analysis of the change in the frequency of ICD-10 code use and patient volumes in the six weeks before and after the changes in clinical practice associated with COVID-19. RESULTS: The total number of encounters decreased four-fold after the implementation of clinic changes associated with COVID-19. The low vision, pediatric ophthalmology, general ophthalmology, and cornea divisions had the largest total decrease of in-person visits. Conversely, the number of telemedicine visits increased sixty-fold. The number of diagnostic codes associated with ocular malignancies, most ocular in�ammatory disorders, and retinal conditions requiring intravitreal injections increased. ICD-10 codes associated with ocular screening exams for systemic disorders decreased during the weeks post COVID-19. CONCLUSION: Ophthalmology practices need to be prepared to experience changes in practice patterns, implementation of telemedicine, and decreased patient volumes during a pandemic. Knowing the changes speci�c to each subspecialty clinic is vital to redistribute available resources correctly.


Background
In the wake of the spread of COVID-19 in the United States, the practice of ophthalmology has undergone a dramatic and unprecedented shift.[18][19][20][21][22][23][24][25][26][27] Adherence to these recommendations has resulted in an estimated 75% or more reduction of in-person clinic volumes. 280][31] However, the exact reduction of in-patient visits, increase in telemedicine encounters, and the change in the types of diagnoses seen within in an ophthalmology clinic before and after COVID-19 remains unknown.Herein, we describe these changes in clinic volume over all subspecialists in an academic eye clinic as epiphenomena of COVID-19 in ophthalmic practice.

Methods
This was a retrospective analysis of all the ICD-10 diagnosis codes listed in patient encounters from all of the divisions within the Wilmer Eye Institute, main site and satellite clinics, during the 6 weeks prior to (2/17/20 through 3/21/20) and the 6 weeks after the start of emergency visits (3/22/20 through 4/30/20) in response to COVID-19.ICD-10 codes allow for speci cation of eye laterality, affected site, and other complications in systemic diseases.All ICD-10 codes for the same diagnosis were consolidated and divided into categories based on ophthalmic subspecialty service at the Wilmer Eye Institute: cornea, oculoplastic surgery, retina, uveitis, pediatric ophthalmology, neuro-ophthalmology, glaucoma, trauma and general ophthalmology, low vision, and oncology.Included with general ophthalmology were ICD-10 codes associated with screening for systemic diseases affecting the eye.The ICD-10 codes were then subdivided into 177 categories based on anatomic location or mechanism of disease (Supplement 1 and Figure 1).To compare frequency of visits by subspecialty, retina and oncology were merged due to the dual training of our ocular oncologists.Since they also see other retinal conditions in their clinical practice, it was impossible to completely isolate ocular oncology and retina department visits.The rest of the subspecialties were divided in the same way as previously described.
In addition, the number of patient encounters overall and per department were recorded and subdivided into in-person and telemedicine types.Diagnostic categories and encounter frequencies were analyzed; comparisons were evaluated using the χ2 test or Fisher exact test if expected counts within a category were <5.Statistical analyses were performed using SPSS software version 22.0 (IBM, Armonk, NY, USA).
We considered a p-value below 0.05 to be statistically signi cant.This study was reviewed and approved by the Johns Hopkins Hospital Institutional Review Board (IRB00250067).

Results
In the six weeks prior to the start of emergency visits, there were 25,336 completed in-person visits, which resulted in the use of 5,261 ICD-10 codes.This is compared with the drastic reduction of patients seen in the 6 weeks thereafter when 5,672 in-person visits were completed, which included 2,207 ICD-10 codes.
Analyzing the change in the proportional frequency between the 6 weeks after the start of emergency visits and the six weeks prior, the retina, uveitis, and oculoplastic surgery divisions showed a signi cant increase in in-person visits (p<0.001,<0.001, and 0.032, respectively).Low vision, pediatric ophthalmology, general ophthalmology, and the cornea division percentage of in-person visits signi cantly decreased (p<0.001,<0.001, <0.001, 0.001 respectively).There was no signi cant change in appointments within the glaucoma or neuro-ophthalmology divisions (Figure 2).In contrast, the amount of telemedicine visits increased 60 fold in the 6 weeks after the start of emergency visits and accounted for 7.6% of total visits during that period (p <0.001).
We found signi cant differences in the proportion of ICD-10 codes used in between the pre-and the post-COVID-19 change to emergency in-patient visits (Supplement 1 and Table 1).Of the anterior segment disorders, conjunctival and corneal malignancies, complications of contact lens use, peripheral corneal disease, viral keratitis (Figure 3) and corneal ulcer ICD-10 codes were used signi cantly more frequently in the six weeks after the shift to emergency visits.Conversely, pterygium and pinguecula, cataract, and refractive surgery ICD-10 codes were used signi cantly less during the same time period.Speci cally related to glaucomatous conditions, there was a signi cant increase in the use of neovascular, juvenile or congenital, uveitic, and secondary glaucoma ICD-10 codes in the weeks after COVID-19 with a concurrent decline of glaucoma suspect and angle-closure suspect codes.
In the neuro-ophthalmology division, optic disc edema, sixth nerve palsies, optic neuritis, and pseudotumor ICD-10 codes were used more frequently post-COVID-19; whereas, the code for nystagmus decreased signi cantly in frequency.Within the retina division, there was a signi cant increase in ICD-10 codes associated with the need for injections, such as vein occlusions with macular edema, active wet age-related macular degeneration, active choroidal neovascular membranes (CNVM), and proliferative diabetes with cystoid macular edema (CME).Conversely, ICD-10 codes associated with chronic chorioretinal diseases and retinal screening exams signi cantly decreased, which included choroidal scars, retinal dystrophies, diabetic eye exams, and screening for hemoglobinopathies.
The uveitis division showed a decrease in ICD-10 codes associated with screening for ocular complications of HIV disease, but no other uveitis associated codes declined.Rather, ICD-10 codes for primary intraocular lymphoma, Vogt-Koyanagi-Harada disease and sympathetic ophthalmia, traumatic uveitis, non-corneal herpetic diseases, and intermediate uveitis were used sign cantly more than in the pre-COVID-19 time period.Ocular oncology, as well, showed a signi cant decrease in the use of choroidal nevus screening codes and showed a sign cant increase in the use of choroidal mass codes.
Interestingly, none of the codes associated with pediatric ophthalmology, low vision, and oculoplastics had a proportional increase after the change in in-person visits associatd with COVID-19 were implemented.The ICD-10 codes that declined the most were ocular screenings for chromosomal abnormalities, phorias, and strabismus.In oculoplastic surgery, ICD-10 codes for dermatochalasis, eyelid malpositions, benign tumors of the lids, and obstructive lacrimal duct disease also declined.Finally, ICD-10 codes associated with low vision decreased 27 fold in the six weeks post-COVID-19.
Curiously, ocular trauma showed a proportional increase in ruptured globes and intraocular foreign bodies in the six weeks after the COVID-19 changes.ICD-10 codes for screening for eye or systemic medical disorders, a family history of eye disease, and refractive error were used signi cantly less frequently than in the six weeks pre-COVID-19.

Discussion
5] Equally striking, was the signi cant decline in ophthalmic screening exams for systemic disorders, research study visits, and low vision services.As a whole, ophthalmic conditions leading to immediate vision change, pain and photophobia, ocular malignancies, and trauma continued to be seen in-person.
The speci c ICD-10 code frequency changes within each subspecialty requires individual discussion.For conditions affecting the cornea, a signi cant increase in the percentage of patients seen with ulcers, complications of contact lens use, and peripheral diseases including ulcerative keratitis occurred in the six weeks following the start of emergent visits.This again highlights the continued presentation of patients with ocular pain, photophobia, and change in vision.5][26][27][28][29][30][31][32] The largest statistically signi cant decreases were seen in post-cataract follow-up visits, as evidenced by a decrease in ICD-10 codes for posterior capsular opaci cation and pseudophakia.All of the pre-operative and non-urgent follow-up rescheduling led to a 78% drop in visits.
Conversely, as noted by Skalet et al., the time-sensitive nature for evaluation and continued treatment of ocular malignancies requires appointment exibility and patient-centered judgement on the risk of delaying care during COVID-19 with possible tumor progression. 16In our department the percentage of choroidal masses and corneal malignancies diagnoses increased, whereas screening exams for choroidal nevi decreased signi cantly.Oculoplastic surgery evaluations were also dramatically decreased with the rescheduling of elective visits given the corresponding drop in use of dermatochalasis, benign eyelid lesions, and ptosis ICD-10 codes.While the frequency of stye ICD-10 codes increased, chalazions decreased signi cantly with postponement of non-urgent surgeries.
Neuro-ophthalmic conditions that increased signi cantly in the weeks following COVID-19 caused diplopia, headache, and loss of vision.On the other hand, exams for nystagmus decreased signi cantly, re ecting patient presentation to assess acute changes in vision.
Similarly, retinal conditions resulting in vision loss continued to be evaluated at statistically increased frequencies, including macular holes, retinal detachments, vitreous hemorrhages, or cystoid macular edema.Chronic conditions or those requiring long-term monitoring decreased in the weeks post-COVID.Retinal conditions at high risk for complications, such as inactive wet macular degeneration, and conditions requiring continuation of intravitreal injections, such as diabetic macular edema, continued to be seen frequently in alignment with recommendations for continued treatment during COVID-19. 19,21,26ne of the highest risk groups for complications related to COVID-19 infection are those over 65 years-old or with pre-existing health conditions, which describes the demographics of many patients receiving intravitreal injections. 19,26,35 atients and providers needed to weigh the risk of possible COVID-19 exposure with disease progression or the development of additional ocular complications with the postponement of anti-vascular endothelial growth factor (anti-VEGF) injections and possible disease progression. 19Interestingly, the codes for neovascular glaucoma (NVG) signi cantly increased in the six weeks post-COVID.Thus, a further study is needed to assess the relationship between the increase in NVG ICD-10 codes and the postponement of anti-VEGF injections during the pandemic.
Overall, the majority of ICD-10 codes for glaucomatous conditions increased in frequency signi cantly post-COVID 19, re ecting the continued need for in-person intraocular pressure monitoring. 18In comparison, pediatric ophthalmology experienced a decrease in routine screening for ocular disorders in patients with congenital or chromosomal abnormalities and strabismus evaluations, but the retinopathy of prematurity (ROP) screening code frequency did not signi cantly decrease.Guidelines for seeing pediatric ophthalmology patients have been offered and include patients risk for amblyopia, requiring evaluation for leukocoria or congenital glaucoma, infection, or nystagmus. 36Although only ve ICD-10 codes were used in the six weeks after COVID-19 for ROP, it still illustrates the continued need for inpatient ophthalmic consultations during COVID-19.
In term of in-person visits, the number signi cantly increased for the uveitis division given the reliance on slit lamp evaluation for cell and are. 20Correspondingly, there was a signi cant increase in the numbers of ICD-10 codes for all anatomic locations of undifferentiated uveitis and scleritis.Concurrently, uveitic glaucoma ICD-10 codes signi cantly increased in the weeks after COVID-19.As with NVG, assessing if a relationship between the increase in ICD-10 code use for ocular in ammatory diseases and uveitic glaucoma would be another area for future research.As in other divisions, screening exams for ocular complications of rheumatologic conditions or HIV were signi cantly decreased.The frequency of high risk medication use and monitoring was the same in the weeks prior to and after COVID-19, but the decrease in number was not signi cant.This group included patients on immunosuppressive medications prescribed to treat ocular in ammation, illustrating the need to safely continue these medications, in-person evaluations, and lab draws to in the time of COVID-19. 20,37Interestingly, all types of herpetic eye diseases increased in frequency signi cantly in the 6 weeks after COVID-19.Herpetic disease has been associated with depression as a trigger for reactivation, which has also been noted to increase during COVID 19. 38,39 Multiple strategies have been employed to slow transmission of the virus, including stay at home orders, limiting non-essential businesses and travel.While these actions promote social distancing, ocular trauma is still occurring. 40,41Previous papers have described an overall decrease in ocular trauma with a subset increase in ocular trauma related to home activities during COVID-19.Only Peligrini et al. noted a stable rate of orbital fractures and open globe injuries.While we could not assess where the ocular trauma occurred using ICD-10 codes alone, we did have an increase in all forms of penetrating and blunt ocular trauma during active stay-at-home orders in Baltimore.Furthermore, there was a statistical increase in the frequency of corneal abrasions and trauma, traumatic iritis, intraocular lens dislocations, and blunt non-penetrating trauma in the 6 weeks after COVID-19.While there was a decrease in use of ICD-10 codes associated with eyelid trauma, orbital fractures, subconjunctival hemorrhages, and red eyes, these were not statistically signi cant.In short, all types of ocular trauma still presented for emergent care during COVID-19.Because our institute is the only state-designated Level I Eye Trauma Center in the state of Maryland and some bordering states, it is possible that the increase in trauma observed in this analysis occurred as the result of other potential caregivers having closed their practices or otherwise not being available to care for these patients.
A limitation of this study is the common practice of carrying diagnoses forward during follow-up visits.Although this may change the proportion of active diseases being evaluated in each period, there is no evidence that carrying diagnoses forward would be different in two time intervals studied.Conversely, the strengths of this report are the large number of visits and ICD-10 codes reviewed over all ophthalmic subspecialties.Our analysis sheds light on which diseases are more commonly treated in a real-life, state of emergency.It provides generalizable evidence for ophthalmology departments and health systems alike to allocate human resources and materials to meet patient needs during a pandemic.In our population, ocular trauma occurred in equal numbers during both study periods.This illustrates the need to continue ophthalmic operating room availability and to maintain an uninterrupted ophthalmology trauma on-call schedule even as providers are redeployed to provide medical care in other departments.][5][6][7][8][9][10][11][12]20,37 Even in the subspecialty clinics where a signi cant decrease of visits was noted, diagnostic codes were still used for patients with acute changes in vision.Thus, a provider within each subspecialty division should remain available for in-patient consultation on a daily basis.
One question that will need to be addressed is whether the pandemic has resulted in the avoidance or delay in care for some individuals, who may as a result be at substantial risk for worse ultimate outcomes.Our nding that fewer patients were being screened for HIV-associated retinal disease and that fewer "glaucoma suspects" were seen during this period may mean that pathology in at least a subset of these individuals will have progressed before they are able or willing to present to the ophthalmologist.We suspect, but our study does not allow us to quantify, that there will be an ultimately greater burden of disease as a result of postponed screening visits and timely therapeutic interventions.
In conclusion, an academic ophthalmology department associated with a tertiary referral hospital should be prepared to experience changes in practice patterns, implementation of telemedicine, and decreased patient volumes during a pandemic.Knowing the changes speci c to each subspecialty clinic is vital to correctly redistributing available resources.Looking forward, a cost-effectiveness analysis is needed to discern the best way to address these changes while continuing to provide safe patient care and lessen the economic burden of these trying times.

Figures
Figures

Figure 1 Diagnostic Categories by Subspecialty Figure 2 A
Figure 1